->''"Squids squirt ink to create a substitute to escape their predators. It's an oily substance, difficult to dissolve in water, that becomes a sort of mass. On the other hand, octopi use ink as a smoke screen. It is water soluble in order to spread. Like oil and water, even the inks of the two species doesn't mix."''
-->-- '''Creator/{{Nintendo}} EAD''' on ''Videogame/{{Splatoon}}''

Sometimes, different species, such as [[CatDogDichotomy cats and dogs]], are written so that they have a built-in and unquestioned animosity for no other reason than that they are stereotypically considered to be adversaries. A dog that doesn't chase cats will be considered 'weird', even if they were raised together from birth. On the other hand, those same dogs will almost never chase after mice unless provoked.

RealLife [[PlayingWithATrope is more diverse]]. In general cats will flee from larger predators and dogs will chase whatever flees from them. But there are also cats who bully dogs. There are also plenty of cats and dogs who get along very easily and even like each other. Both will usually eat mice.

See also CatsAreMean, DogsHateSquirrels, and MailmanVsDog. Related to ElvesVersusDwarves, FurAgainstFang, TigerVersusDragon, FantasticRacism.


[[folder:Anime and Manga]]
* ''Anime/{{Pokemon}}'';
** The mutual hatred between Zangoose and Seviper (see below in Video Games) became a plot point in a ''Diamond and Pearl'' episode, when a far too single-minded pack of Zangoose attacked Jessie's Seviper repeatedly throughout the episode, ultimately threatening to push it (along with Jessie herself, the rest of Team Rocket, and half the heroes' Pokémon) ''off a cliff''.
** In "Showdown at Dark City", Electabuzz and Scyther are stated to be mortal enemy species. However, this is never mentioned again.
** A downplayed case between Ash's Lycanroc and Litten in the ''Sun and Moon'' series, who are dog and cat-like species respectively and {{Friendly Rival}}s.
* TigerVersusDragon, Snake vs Frog, Dog vs Monkey appear to be Japanese versions of the dog/cat thing, since they're alluded to often in anime and manga. TigerVersusDragon started off as an allegorical representation of Yin and Yang, Snake vs Frog is based on an Edo Period "Rock-Paper-Scissors" style matchup[[note]]This was codified in folklore by the famous epic ''Jiraya Gouketsu Monogatari'' featuring two ninja rivals, one using toad magic and the other using serpent magic[[/note]], and Dog vs. Monkey is a stereotype that started when farmers used dogs to keep monkeys away from their crops.
* In a one panel gag, ''Manga/SangatsuNoLion'' once uses the snake and mongoose rivalry as a visual metaphor for a heated argument between Rei and Nikaidou.
* In ''Manga/FruitsBasket'', Kyo and Yuki hate each other. Kyo is the cat in the zodiac while Yuki is the rat.
* In ''Manga/GingaNagareboshiGin:'' Dogs and bears are mortal enemies. The whole plot revolves around the dogs gathering enough "soldiers" to battle the bears, and the actual battle itself. Though the protagonist is able to overcome this, as shown when he got upset after seeing another dog kill two innocent bear cubs.
* ''Manga/InuYasha'': PlayedForLaughs with the animosity between Inuyasha ([[HalfHumanHybrid Half]]-dog-{{youkai}}) and Shippou ({{kitsune}}). In Japanese folklore, dogs and foxes hate each other and more than one secret {{kitsune}} wife has been outed by the clueless husband's loyal dog. Inuyasha is [[BrattyHalfPint Shippou's]] favourite target for pranks and practising his magic on, so Inuyasha tends to [[HairTriggerTemper bite back]].

[[folder:Comic Books]]
* ''ComicBook/{{Gear}}'' is about a war between four nations of small cats, larger cats, dogs, and insects, doing battle by means of HumongousMecha!
* The basis for the animal metaphor in Creator/ArtSpiegelman's graphic-novel-style biography about his parents' experiences in the Holocaust, ''ComicBook/{{Maus}}''. The Nazis are portrayed as cats, the Jews as mice; other nationalities are also portrayed as animals, depending on certain stereotypes of those nationalities and those animals.
** Same deal in the Manga ''Manga/ApocalypseMeow'', except it's a Japanese writer examining the Vietnam conflict. Americans are rabbits, Vietnamese are cats, Russians are bears, Chinese are pandas, French are pigs, and Japanese are monkeys (including an unflattering AuthorAvatar).
* According to Stephen Notley's comic strip, ''Webcomic/BobTheAngryFlower'', robots and bears are natural enemies. This makes as much sense as anything else in ''Bob the Angry Flower.''
* ''Comicbook/TeenTitans'':
** In a parody of Creator/MarvelComics' ''House of M'' and Creator/DCComics' ''Identity Crisis'', which both ended with the revelation that a female character had undergone a FaceHeelTurn for [[DorkAge flimsy reasons]], an issue of ''Comicbook/TeenTitans'' shows the FunnyAnimal {{Superhero}}es of ''Comicbook/CaptainCarrotAndHisAmazingZooCrew'' learning that feline former teammate Alley-Kat-Abra is responsible for various crimes, including the murder of Little Cheese, the micro-mouse. The reason given is "I'm a ''cat''! Cats ''hate'' mice!"
** The trope is [[SubvertedTrope subverted]] in ''Captain Carrot and the Final Arc''; the ''real'' murderer is revealed to be Alley's magically created EvilTwin, and the true Alley vows to resurrect Little Cheese. Interestingly, the story of Little Cheese' murder by Alley Kat Abra was apparently written under [[ExecutiveMeddling editorial fiat]]- Scott Shaw! (yes, the exclamation point is part of his name), the creator of the characters, when encountered at a Con, said that he was strongly opposed to the story idea, but told he had to do it anyway. The 'evil twin' retcon was his just revenge upon those editors after they'd gotten the boot.
** Considering on Earth-C, cats and mice * don't* hate each other (and any cat or mouse that did would be considered a bigot/speciesist), it makes the above-cited "reason" as all the more out-of-character for Alley (and thus should've given reason for the Crew to be suspicious). Supporting this is one story where the Zoo Crew, while visiting other dimensions briefly, encounter one resembling ''WesternAnimation/TomAndJerry''; Alley found the sight of seeing "a planet terrorized by...primitive felines" to be disturbing.
* In one of the many, many (in canon) ComicBook/{{Supergirl}} series for Creator/DCComics, it is revealed that the rivalry between cats and dogs is based on ancient cat-gods and dog-gods, a fight that still goes on in another realm today.
* French noir-style FunnyAnimal (well, not really funny, it's mostly dead-serious) comic ComicBook/{{Blacksad}} has a rather dark twist on this in its second tome, ''Arctic Nation''- the eponymous organisation is that world's equivalent to the KKK and paramilitary neo-nazi groups, only made up of white-furred or feathered anthropomorphic animals who hate dark brown- and black-colored animals, even if the same species. There's also a less-seen Black Panthers equivalent for good measure.
* ''ComicBook/{{Cubitus}}'': Cubitus the dog and Sénéchal the cat are sworn enemies and rivals who take delight in beating each other up.
* ''ComicBook/TomPoes'': No jingoism seems to exist between the animals based on their species. Tom, a white cat, gets along fine with Joost, the dog butler and Bullebas, the dog police chief.

[[folder:Comic Strips]]
* ''ComicStrip/{{Garfield}}'':
** The dogs (minus Odie) enjoy this, and he's asked them why on more than one occasion. They never come up with an answer.
** Garfield also subverts this trope by befriending a mouse named Floyd (and letting him bring other mice over for house parties), much to Jon's annoyance. But he ''does'' play it straight with '''spiders'''.
* Subverted in George Herriman's comic strip, ''ComicStrip/KrazyKat,'' as noted under CatsAreMean.
* Partially subverted in ''ComicStrip/PearlsBeforeSwine'', using sensitive, intelligent character Zebra, whose never-ending efforts to reach detente with various predators (lions, more recently crocs) inevitably fail miserably. In one strip, he writes a moving letter asking why; the lions' response is 'Yu taste gud!'
* In ''ComicStrip/{{Peanuts}}'', Snoopy has always hated cats. On many occasions, he has taunted the "stupid cat next door". Only for the cat - whose name is eventually revealed as "World War Three" - to promptly scare him in return (usually shown as the unseen cat SWIPE!-ing a huge chunk out of the doghouse). The only time Snoopy ever beat that cat is when he thought Woodstock was in danger.
* ''ComicStrip/TheFarSide'' has dozens of cartoons pitting cats against dogs, including the infamous "[[TethercatPrinciple Tethercat]]." One sketch published in ''The [=PreHistory=] of the Far Side'' has cat-shaped and dog-shaped protoplasms striking hostile poses at each other, with the caption, "And cats and dogs have hated each other ever since."

* ''Film/CatsAndDogs'':
** The first film had unwaveringly heroic dogs constantly defending humanity from [[AlwaysChaoticEvil unchangingly evil]] cats throughout recorded history.
** Subverted in the sequel, which features a cat agency dedicated to protecting humanity.
* Averted in ''Film/TheAdventuresOfMiloAndOtis'', a story about a cat and a pug dog who are friends. Though it is kind of seen as an OddFriendship by other animals.
* ''Disney/TheLionKing'' features a lion/hyena rivalry, which actually reflects the reality of the African savannahs to a certain extent. Though ''The Lion King'' inverts it, based on the [[ScienceMarchesOn old misunderstanding]] of their interactions. Newer research suggests that its the hyenas who do the hunting and it's the lions who muscle them away from their kills. Even newer research suggest that both sides play both roles when it suits their purposes, though lions still do most of the stealing.
* In ''Film/NicoTheUnicorn,'' mountain lions and unicorns are said to be natural enemies. This proves true when [[spoiler: one kills Nico's horse mother.]]
* ''Disney/{{Zootopia}}'' subverts the notion that foxes and rabbits are natural enemies. Initially played straight in that Officer Judy Hopps is raised to consider foxes as dangerous and untrustworthy, has a childhood experience where she is hurt by a fox and urged by her father to carry fox repellent. Yet her investigation forces her to work with Nick Wilde, a red fox, and while solving the case Judy gradually confronts her prejudices and she and Nick become best friends [[spoiler: and, when Nick joins the ZPD in the epilogue, partners]].

* ''Literature/ReynardTheFox'': Reynard is considered to be the rival of Isegrim the wolf.
* Averted in the ''Literature/TheCricketInTimesSquare'' series by George Selden, which features a mouse (Tucker) and a cat (Harry) who are best friends. A flashback book even averts CatsAreMean by having Harry be the one to initiate the friendship in the first place. A later book even has the pair adopting an orphan puppy.
* Subverted in ''Discworld/TheAmazingMauriceAndHisEducatedRodents'' (Except for [[spoiler:the rodent that Maurice ate to become "amazing" in the first place]], but that was [[spoiler:before he became intelligent, obviously]]).
** The ancient enmity between rats and humans is also subverted. Between rats and terriers, not so.
* Explained in an African folk tale. According to the story, Cat and Dog were once great friends and did many friendly things together. But then came hard times and Cat and Dog had to go their separate ways. Dog wandered off and Cat found a human family to shack up with. Dog eventually went to Cat and begged to be allowed in so he could get a decent meal. Cat took pity and directed Dog to his owner's brother, but not before extracting a promise that Dog not come back. Dog kept his promise for a while, but eventually either forgot or judged that circumstances rendered the promise moot, and shambled on back to see Cat. Cat was pissed, to say the least. So dogs aren't chasing cats because they hate cats-they want to be friends again, and cats still refuse to forgive.
* Many other animals don't come off looking too good in the mythology of ''Literature/WatershipDown''. Dogs in particular are portrayed as ''incredibly'' [[DogsAreDumb stupid]] compared to the GuileHero El-ahrairah. In this case it's because the story is actually told from the point of view of rabbits, who being prey animals see most other animals as horrifying and monstrous killing machines.
* ''Literature/{{Redwall}}'' has many varieties of this (though the animal characters are essentially humans with fur). Rats and mice have disliked each other from book one. Raptors are hostile toward prey species until they've been properly introduced. Four-legged predators (except for badgers and otters) are usually antagonistic throughout the story.
* Often appears in books by Creator/DickKingSmith.
** Sheep and dogs in ''The Sheep-Pig'' (filmed as ''Film/{{Babe}}'') are both convinced the other is irredeemably stupid, and sheep also refer to dogs as 'wolves', refusing to believe they have truly changed their nature.
** ''Martin's Mice'' is about a cat who hates the idea of killing and eating mice and eventually tries to keep them as pets.
** The more conventional cats vs. dogs one shows up in ''Ace'', with the DeadpanSnarker cat a more sympathetic character than the snobbish dog (who believes that being a corgi grants her [[UsefulNotes/TheBritishRoyalFamily some kind of royal status]]).
* In Creator/RudyardKipling's ''The Cat That Walks By Itself'', after the cat can't resist giving a snarky answer, the dog declares that it will chase cats, and the story ends with the statement that this is why dogs to this day usually chase cats.
* Played with in ''Literature/TheIncredibleJourney'' with Bodger the bull terrier and Tao the Siamese. The two of them both hate (other) cats, and because of this are ''best friends'', having bonded by terrorizing the local cat population together.
* Played dead straight in ''Literature/TailchasersSong'', in which the cats even have a legend that serves as an OriginStory for the rivalry between their kind and dogs.
* Creator/ErinHunter:
** Cats in ''Literature/WarriorCats'' view dogs as either annoying and filthy (they don't cover their "dirt" like cats) or brutish predators when let loose. This is justified as, because they're feral cats, they don't have any socialization with dogs like kittypets do.
** Sharpclaws are not much danger to dogs in ''Literature/SurvivorDogs''. They are however annoying, especially their claws. Dogs also view them as sadistic animals who torture their prey.

[[folder:Live Action TV]]
* Several Wesen species in ''Series/{{Grimm}}'' are enemies; the wolf-like Blutbaden vs the pig-like Bauerschweins, the snake-like Lausenschlange vs the mouse-like Mauzhertz, etc.

[[folder:Tabletop Games]]
* In ''TabletopGame/DungeonsAndDragons 3.5'', this was completely averted with the guardinals. Thanks to the nature of these celestials as warriors devoted to the highest good ([[NeutralGood and only good]]), none of the various species ever (or [[WorthyOpponent rarely]] [[ProudWarriorRaceGuy ever]]) come into conflict, not even such "traditional" enemies as cats and dogs. One of the clearest representations of this is described in the ''Book of Exalted Deeds'' with Talisid and the Five Companions: not only does [[ModestRoyalty Talisid]] consider all of the companions his closest friends, acting more like an epic adventuring company [[TrueCompanions "bound by fierce devotion that puts mere family loyalty to shame"]], but Duke Kharash, [[NobleWolf the lupinal guardinal]], is given the moniker of "Talisid's Shadow" because he is "the closest companion to Talisid, sharing the Celestial Lion's passion for the hunt as well as his love for the untamed wilderness. [[HeterosexualLifePartners The two are nigh inseparable]]..." Let the HoYay commence.
* ''Cat: A Little Game About Little Heroes'' explains that 1000 years ago, cats won a three-way competition between cats, dogs, and humans, thus earning the right and responsibility to protect the last-place entry (humans) from evil. Dogs also love humans and protect them, but resent the cats for beating them.

* You will often see foxes and wolves paired as rivals; this goes back to the "beast epics" of Literature/ReynardTheFox, which featured Reynard and his rivalry between the wolf Isengrin. For a more modern example, well, how about, "Can't let you do that, VideoGame/StarFox!"
** In one educational {{Creator/Sierra}} textgame (Apple II era), wolves ''eat'' foxes.
* ''Franchise/{{Pokemon}}''
** Zangoose (a mongoose) and Seviper (a snake), are natural enemies who attack each other on sight, to the point where their rivalry seems to be the only trivia ever mentioned in their Pokédex entries. Despite this, [[FoeYay they can breed with each other]].
** Heatmor (anteater) and Durant (ant). One attacks the other for food, the other retaliates in self-defence.
** In both cases, you can actually [[GameplayAndStoryIntegration witness the jingoism]] in horde battles in ''VideoGame/PokemonXAndY'', where you'll fight four of one and one of the other, with the four ganging up on the one and ignoring you.
* Averted in ''VideoGame/{{Touhou}}'' with the three {{Cat Girl}}s, who are in friendly terms with other characters of species usually enemy to cats. The first, Chen the Nekomata, is the servant of Ran Yakumo, a {{Kitsune}}, which is related to dogs. The second, Orin the Kasha, is best buds with Utsuho, a [[CreepyRaven Hell Raven]] AKA a bird. The third one is Shou Toramaru (actually a tiger), who is the master of the mouse {{youkai}} Nazrin.
* ''VideoGame/{{Splatoon}}'' features a rivalry between the surface-dwelling Inklings (squids) and the subterranean Octarians (octopi). They both were enemies of [[GreatOffscreenWar the Great Turf War]] 100 years ago, and the single player campaign kicks off after the Octarians steal the Inklings's energy source. [[spoiler:Relations used to be amicable before the Great Turf War, which started because of increasingly limited territory due to the rising seas]].
* ''VideoGame/SenranKagura'' features the Hanzo shinobi school, with a frog logo. Their most direct rival is the Hebijo school, symbolized by a snake.
* The boss of the ''VideoGame/{{Battleborn}}'' DLC "Toby's Friendship Raid" is an anthropomorphic leopard seal alien and the nemesis of Toby the [[BirdPeople penguin alien]]. Fitting, since in real life leopard seals eat penguins.
* The Ocean King in ''VideoGame/TheLegendOfZeldaPhantomHourglass'' is tormented by the evil creature Bellum. They're divine entities, but that doesn't expel the fact that the Ocean King is a whale and Bellum is a squid.

* Half the jokes in ''Webcomic/KevinAndKell'' rely on this, or subvert it.
* ''Webcomic/GunnerkriggCourt'' features Reynardine and Ysengrin, the fox and wolf of legend. While neither of them can really claim to be those animals anymore, Ysengrin was very upset to see Reynardine take the form of a wolf.
* Percival and Pooch in ''Webcomic/{{Sinfest}}'' -- [[http://www.sinfest.net/archive_page.php?comicID=3255 at least professed on Percy's part]]
* ''Girly'' has made that [[http://girlyyy.com/go/510 chickens and ducks are sworn enemies]].
* In ''Webcomic/{{Poharex}}'', the dinosaurs have a mortal emnity with the Rakair, a species of evolved rauisuchians. They also hate humans, though to a lesser extent.
* In ''Webcomic/{{Homestuck}}'', [[spoiler:Jade]] can't help but growl and bark at Jaspersprite when he starts meowing, because the latter is a cat, and the former, through a very complex series of events, has the instincts of a dog.
* ''Webcomic/BobAndGeorge'': [[http://www.bobandgeorge.com/archives/031107 Rush, Tango and Treble]] have this going on, even though they're all ''robots''.
* In ''Webcomic/CoyoteVille'', Sean, a coyote, often hunts rabbits via ''WesternAnimation/LooneyTunes''-style trickery.
* ''Webcomic/TheGlassScientists'': Jasper's reaction to a cat falling on his head suggests that werewolves and cats aren't exactly best friends.

[[folder:Web Originals]]
* The cat/dog rivalry is inverted in [[http://reynardnoir.wordpress.com/ Reynard Noir]], where Cassandra Cat and the technically canid Slylock Fox have an on again/off again romance. However, speciesm is fairly rampant amongst the population as a whole, especially in the case of predator vs. prey species or humans vs. nonhuman. Sayings such as 'blind as a bat' are even regarded as speciest slurs.
* Alluded to in ''WebAnimation/{{RWBY}}'', where CatGirl Blake reacts with inexplicable hostility to a puppy one of her roommates just got.
* This is PlayedForLaughs in ''WebAnimation/RWBYChibi'', where Blake is constantly hiding from her roommate's puppy and is, at times, horrified to be around him.

[[folder:Western Animation]]
* Parodied in ''WesternAnimation/RockosModernLife'':
** Heffer's grandpa (a wolf, see below) hates wallabies. The good news is, his eyesight isn't so good and he mistakes Rocko for a beaver. The bad news is, he's not too keen on beavers either.
** Cats and turtles are said to be mutual enemies, without much explanation, in the episode "The Big Question"/"The Big Answer." This rivalry exists [[RuleOfDrama solely for the purpose of creating tension]] leading up to the marriage of recurring characters Filburt (a turtle) and Dr. Hutchinson (a cat).
** One episode shows Heffer -- a steer who was literally RaisedByWolves -- being sent out to "bring an elk home for dinner". He ends up dating one.
* The Greasers (a trio of dogs) from ''WesternAnimation/{{CatDog}}'' hate [[FantasticRacism cats with passion]], making it their hobby to beat up [=CatDog=] whenever they meet. Cat himself is shown to carry a strong hatred for Winslow (a mouse) too, though that might not be completely due to his natural instincts considering Winslow's [[{{Jerkass}} personality]].
* ''WesternAnimation/MyGymPartnersAMonkey''. Here, the animals are sentient and speak and are anthropomorphic (some more than others) but the snake kid still fights with the mongoose kid only after learning from a documentary that they're natural enemies.
* Subverted in the "Rita and Runt" segments of ''WesternAnimation/{{Animaniacs}}'' in which Runt habitually goes into an aggressive posture/attitude at the mere mention of a cat, yet is too stupid to recognize that [[YouKnowImBlackRight his best friend Rita is a cat]].
* Most of the ''WesternAnimation/TomAndJerry'' cartoons fall into this. Jerry is chased by Tom who is in turn chased by Spike solely because they are a mouse, cat, and dog. Yet at the same time they are shown to get along with each other fine. In one cartoon where Tom throws Jerry out he starts to miss him and is glad when he is actually back.
** [[Creator/HannaBarbera Hanna and Barbera]] later went on to create ''Pixie and Dixie and Mr. Jinks'' (for ''WesternAnimation/TheHuckleberryHoundShow''), and ''Motormouse and Autocat'' (for the Cattanooga Cats show) which naturally have similar themes; the latter involving vehicles.
* ''WesternAnimation/AnAmericanTail'' uses the old Cats vs Mice rivalry as a metaphor for the rich vs the oppressed immigrants in the late 1800's.
* In ''WesternAnimation/AdventureTime'', Dogs and the fictional Rainicorns are enemies, though unlike most examples, there's a reason: they [[GreatOffscreenWar fought over territories in the Crystal Dimension]].
* ''WesternAnimation/LooneyTunes'': Tweety and Sylvester. "I tawt I taw a puddy tat!"
* In ''WesternAnimation/ThunderCats2011'', this is very much PlayedForDrama. Third Earth is presented as a "''[[WorldOfFunnyAnimals world of warring animals]]''" where Thundera's ProudWarriorRace the [[{{Catfolk}} Cats]] rule their [[TheEmpire empire]] as the self-styled SuperiorSpecies that brought order to their world. They've fought a generations-long war with the [[LizardFolk Lizards]], and see [[FantasticRacism little problem]] with [[MadeASlave enslaving]] those hungry Lizards they catch raiding their crops due to the Cats' systematic monopolization of arable land, even ''[[VigilanteExecution lynching]]'' them, if they feel like it. The "Alley Cats" of Thundera's [[UrbanSegregation slums]] think nothing of beating and mugging hapless Specific minorities like [[{{Dogfaces}} Dogs]]. All tailed Cats are themselves [[FantasticGhetto confined]] to the slums while tailless nobles live lives of wealth and privilege, and [[KingOfBeasts right-to-rule]] is granted only to Lions.
* WesternAnimation/FelixTheCat's relationships with mice range from friendly to VitriolicBestBuds-ish. Notably, he has a mouse friend, Skidoo, living in his house.
* In ''{{Disney/Bolt}}'', Mittens tells Bolt that cats hate dogs - because secretly they want to ''be'' dogs. Throughout the film, she and Bolt echo cat/dog rivalry sentiments, addressing each other as "Dog" and "Cat" until their friendship grows. The ShowWithinAShow plays this up as well, giving its villain the name Dr. Calico and [[RightHandCat a fondness for cats]] -- which, it's implied, he employs as spies.
* ''WesternAnimation/{{Babar}}'' has elephants and rhinoceros as enemies. This is partially based on RealLife as both animals are known to be aggressive to each other in certain situations. Also it helps the traditional depiction of [[HonorableElephant elephants as peaceful]] {{Gentle Giant}}s and [[RhinoRampage rhinos as violent]] AlwaysChaoticEvil, non of both depictions to be entirely fair.
* The ''WesternAnimation/SpongeBobSquarePants'' episode "Pet or Pests" has Gary developing a mutual hatred for a worm [=SpongeBob=] takes in. Fitting as snails and worms in this show are the undersea equivalents of cats and dogs respectively.
* ''WesternAnimation/BojackHorseman'', despite being set in a world where half of the cast are anthropomorphic animals, uses this mostly for one-off visual jokes. Season four has the first instance of it impacting the storyline in a real way, with Princess Carolyn (a cat) being uncomfortable to find out that her mouse boyfriend's family has a holiday dedicated to demonizing cats.

[[folder: Other]]
* ''TyrannosaurusRex'' and ''Triceratops'' are a famous case of this trope. Go into any dinosaur related media and you'll see this trope in action, the ''T. rex'' trying to eat the ''Triceratops'' while the ''Triceratops'' fights back with its massive horns. TruthInTelevision as well, since fossils of ''Triceratops'' have been found with ''T. rex'' bite marks on them. On the rare occasions ''T. rex'' isn't shown battling ''Triceratops'', you can bet it will be going after either an ankylosaur or a hadrosaur instead.
** On the subject of prehistory, you can expect ''Allosaurus'' to constantly hunt either ''Stegosaurus'' or ''Camptosaurus'' or sauropods[[note]]both ''Stegosaurus'' and ''Camptosaurus'' are TruthInTelevision based on fossil evidence, though for sauropods this is debatable[[/note]], ''Deinonychus'' to ZergRush against ''Tenontosaurus''[[note]]initially thought to be true due to close proximity between the species' fossils, though later evidence suggests that ''Tenontosaurus'' was too large for ''Deinonychus'' to tackle (even in a group) and it was deemed more likely that the specimens discovered were scavenging a dead ''Tenontosaurus'' instead[[/note]], the flying reptile ''Pteranodon'' to be snatched out of the sky by predatory sea reptiles[[note]]the only evidence for this are an undescribed plesiosaur with the remains of a small (possibly juvenile) pteranodontid in its stomach, but either way, it almost certainly attacked the unfortunate reptile while it's alighted on the water rather than flying over it; there's more ample evidence that pterosaurs were preyed upon by large fish, dinosaurs, and crocodilians [[/note]], pliosaurs or mosasaurs to bite onto the neck of a plesiosaur, ''Velociraptor'' to do battle with ''Protoceratops''[[note]]TruthInTelevision as evidenced by an [[http://static.guim.co.uk/sys-images/Guardian/Pix/pictures/2009/02/04/velociraptor1.giant.jpg exquisite fossil]] of the two dinosaurs tangled together in combat[[/note]], ''Giganotosaurus'' to harass ''Argentinosaurus'' in a pack[[note]]The two animals, though they did lived around the same time, were not actually from the same geological formation. However, ''Giganotosaurus'''s close relative ''Mapusaurus'' was[[/note]], ''Sarcosuchus'' to attack and drag ''Suchomimus'' to its doom, ''Spinosaurus'' to face-off with ''Carcharodontosaurus'', ''Troodon'' and ornithomimids to raid hadrosaur nests and flee from [[MamaBear angry mothers]], ''Gastornis'' to pursue and devour small horse-like ungulates like ''Hyracotherium''[[note]]ScienceMarchesOn, as [[http://link.springer.com/article/10.1007/s00114-014-1158-2 recent isotopic analysis]] shown ''Gastornis'' was a herbivore[[/note]], ''C. megalodon'' to battle with large toothed whales like ''Livyatan'', and saber-toothed cats to attack large herbivorous mammals like mammoths or giant ground sloths.
** A particularly bizarre example; ''Ornitholestes'' was once commonly depicted as being a specialized bird eater (its name even translates to "bird thief"), and was often shown leaping into the air to grab ''Archaeopteryx'' out of the sky. After [[ScienceMarchesOn science marched on]], this was revealed to be wrong for several reasons: 1. There's no evidence that ''Ornitholestes'' could jump like that 2. ''Ornitholestes'' and ''Archaeopteryx'' were separated by thousands of miles and 3. Research done later in the field of paleontology suggests that ''Archaeopteryx'' couldn't fly ''at all'', meaning that even if ''Ornitholestes'' did hunt it, it would not do so in the manner commonly depicted.
** Another example similar to the above would be ''Megalosaurus'' against ''Iguanodon''. This has dropped out of practice in recent works, as the two animals [[AnachronismStew were separated by millions of years]]. The one large meat-eater that would have actually hunted ''Iguanodon'' in England was ''Neovenator'', though ''Baryonyx'' (who is ironically related to ''Megalosaurus'') would have eaten juveniles as evidenced from fossils.
* GiantSquid vs. Sperm Whale. Any work involving sea life would show these two struggling in the depths; the giant squid grapples the sperm whale with its arms and tentacles as the whale tries to devour the squid. TruthInTelevision, as dead sperm whales have been discovered with dead giant squids in their bellies, confirming that they're part of their natural diet, and these sperm whales also tend to have suction cup induced scars on their faces (most likely caused by particularly combative prey). However most portrayals of them fighting violently are probably exaggerated, especially seeing as the squid is actually ''smaller'' than the whale and was most likely only fighting out of self-defense.
* There are some predators who are indeed [[TrademarkFavoriteFood adapted to feed on a certain prey animal]], and the prey animal typically develops defenses against the predators in order to keep themselves safe. In many of these cases, if the prey species goes extinct or is otherwise removed from the habitat, the predator species [[CripplingOverspecialization follows soon afterward]].