In RealLife, most dogs, whether stray, feral, or pet, are mixed breed. This is not so in many fictional universes. In TV shows and movies, most dogs and dog characters will be purebred. Even in cases where a purebred dog has a litter with a dog of another breed, [[GenderEqualsBreed the puppies will resemble only one of the parents]]. This is rather jarring in shelter and pound settings, where the large majority of dogs are mixed-breed. While there are stray purebreds in RealLife, they only make up a small portion of strays.

This happens for a few reasons. In live action works, studios often use multiple animals to play one animal character. This is a lot easier with a purebred dog, since there are many other individual animals that will look almost exactly the same. It's a lot harder to find "doubles" for a mixed-breed dog that has a more unique appearance. In other cases, studios believe that viewers will respond more positively to a dog of a recognizable breed. Said reason also helps fit into the matter of [[DogStereotype Breed Stereotypes]], in which they want the "girly" dog to be a poodle, a "mean" dog to be a rottweiler, or other dog breeds often associated with certain traits.

Use of this trope in media is often criticized for causing a [[TheRedStapler red stapler]] effect, with certain dog breeds becoming popular after a popular movie or show featuring the breed is released. When that happens, people sometimes try to make a quick buck by breeding as many of the dogs as they can, and they aren't always responsible about it. For instance, the popularity of ''Disney/OneHundredAndOneDalmatians'' is often blamed for many of the genetic problems that occur in dalmatians today.

This trope rarely occurs with other animals.



[[folder:Anime & Manga]]
* In ''Anime/GingaDensetsuWeed'', many of the the dog characters are purebred (or were mixed-breeds that ''appeared'' to be purebred) despite most of them being born and living in the wild.
** At least Weed's case, his parents' breeds (Akita and Kishu) look similar enough that Weed's appearance is plausible, while a few other characters are considerably less likely. The art style is also somewhat notorious for making very different breeds look almost alike (Cross is a Saluki, but her overall build is very similar to the Akitas, for example).
** In ''Anime/GingaNagareboshiGin'', which came before ''Weed'', the trope is somewhat more justified. Many of the characters were dogs bred for hunting who ran away or were abandoned, so it makes sense that most of them would be purebred.
* Obscure anime ''Manga/MassuguNiIkou'' averts this as a plot point: Mametarou feels a lot of anxiety about being a mixed-breed dog when all of his friends are pedigrees. When he finally admits his status to his {{Cloudcuckoolander}} girlfriend Hanako, [[spoiler: she happily responds, [[CrowningMomentOfHeartwarming "Then I'll be a crossbreed, too!"]]]] Hanako herself is a purebred Kishu Inu, but she brings an interesting wrinkle to the trope that's very much TruthInTelevision but rarely mentioned in fiction: she's from an old and highly-prized line, but her proportions aren't quite ideal for the breed and so she was removed from the breeding program. It's not too uncommon for breeders in RealLife to do this, keeping only the animals closest to the breed standard and selling the others as pets (often at a much lower price than a "show quality" animal would go for).
* Iggy from ''Franchise/JojosBizarreAdventure'' is a random street dog who just happens to be a purebred Boston terrier.

[[folder: Comics]]
* In ''ComicBook/DennisTheMenaceUK'', Gnasher and his pups are all Abyssinian Wire-Haired Tripe-Hounds. It's not mentioned whether their MissingMom was also a Wire-Haired Tripe-Hound, but the pups are never referred to as mongrels.[[note]]In parts of Britain a ''tripehound'' is a dismissive and somewhat derogatory term for a scruffy mongrel of uncertain parentage. It's also - for purposes of a childrens' comic - a bowdlerisation of the more demotic ''shitehound''[[/note]]
* Averted with Sandy from ''ComicStrip/LittleOrphanAnnie'', who is a nondescript-looking mongrel. Played with in ''Film/Annie1982'', where Sandy is played by a purebred but is referred to as a mutt. Played straight in ''Film/Annie2014'' as Sandy is played by an Akita.
* Snoopy from ''ComicStrip/{{Peanuts}}'' actually started out as a mongrel however was eventually {{retcon}}ned into a Beagle. He looks [[InformedSpecies absolutely nothing like a Beagle]].

[[folder:Films -- Animation]]
* In ''Disney/OliverAndCompany'', all the main canine characters are purebreds (including a Chihuahua and a Saluki) with the exception of Dodger.
* Other than the titular Tramp, many of the side characters in ''Disney/LadyAndTheTramp'' are purebred. The sequel follows this as well. In a case of GenderEqualsBreed, most of the Lady's litter are females that resemble purebred Cocker Spaniels, while the male puppy, Scamp, resembles his mongrel father.
* The Pixar film ''WesternAnimation/{{Up}}'' has several dogs: one is a Golden Retriever, another is a Doberman, and the rest are all Bulldogs and other "bully breeds".
* The Disney film ''Disney/{{Bolt}}'' doesn't feature many dogs, but the dogs it does show are all purebred (though [[InformedSpecies Bolt doesn't look it]]).
* Averted in ''Animation/RoadsideRomeo.'' Except for Charlie Anna (a bulldog), none of the cast appear to be purebred. This is actually rather surprising in Romeo's case, since he started out as the pampered dog of an obviously wealthy family before being abandoned -- one might expect such a family to get a pedigreed pet.
* As in the book, ''WesternAnimation/{{Felidae}}'' features mostly purebred cats (though you wouldn't know it from the art style).

[[folder:Films -- Live-Action]]
* ''Film/{{Benji}}'' is probably the most famous aversion to this trope, being a mixed-breed shelter dog. In fact, the original producer wanted to use a shelter dog to play Benji in hopes of raising awareness about the plight of abandoned and unwanted dogs.
* Most of the dogs in ''Film/HotelForDogs'' are purebred, which is a little jarring considering all the dogs in the movie are supposed to be strays.
* ''Film/CatsAndDogs'' uses purebred dogs for their main characters along with side and background characters.
* ''Literature/ADogsPurpose'' is about a dog who gets reincarnated repeatedly. All of his forms happen to be purebred.
* ''Film/WhiteBimBlackEar'' plays with this trope. Bim is a purebred Gordon setter, but he's an albino, white with black spots instead of the black with mahogany that is supposed to be the coloring of the breed. His breeder is on the verge of drowning Bim when a customer buys him.

* Averted in the ShortStory "Herr und Hund" (master and dog) by no one by UsefulNotes/DichterAndDenker Thomas Mann. The dog from the title is a mixed-breed pointing dog.
* ''WesternAnimation/{{Felidae}}'' is a rare cat example. The majority of the characters have defined breeds. Oddly, the breed known as the European Shorthair seems to be occasionally used to refer to cats that aren't purebred, when the proper term would be Domestic Shorthair/Longhair, or Moggy. It's unknown if this is a translation hiccup, a mistake on the author's part, or intentional, or catbreeding marching on (the series began in 89, many breeds changed since), but it makes it uncertain whether or not all the cats really are purebred.
* Another cat example exists in ''The Wild Road'' by Gabriel King. Tag is a Burmilla, based off the author's cat Iggy. Ragnar, the King of cats, is a Norwegian Forest Cat based on his cat Finn. Pertelot, the Queen of cats, is an Egyptian Mau. And Sealink is a Maine Coon. However, Magicou, Cy and Mousebreath are not purebred.
* Averted with Mr Fusspot in ''Discworld/MakingMoney'' who, as a rich old lady's pampered pet, you might ''expect'' to be a purebred. Instead, when she challenges Moist to identify Mr Fusspot's breed, he correctly says "Er, all of them?"
* Subverted in ''Literature/SurvivorDogs''. Almost no non-Leashed Dogs are purebred, and several of the ex-Leashed Dogs were mixes as well.
* In ''Literature/WarriorCats'' canon this is subverted as no Clan cat has been described as a purebred. Some ''resemble'' purebreds, such as how Yellowfang resembles a Persian and Bluestar resembles a Russian Blue., however it's impossible for them to be pure as they're feral. Even the ex-kittypets all seem to be nondescript mixes. This doesn't stop fans from referring to certain characters as purebreds though. For example, Bluestar is frequently described as a Russian Blue however she has the wrong eye colour (blue instead of green) and isn't from a purebred Russian Blue lineage.

[[folder:Video Games]]
* {{Postapocalyptic Dog}}s are a recurring element of ''VideoGame/{{Fallout}}'', and since [[YouAllLookFamiliar the same few models are used for all dogs]], if one is a purebred then many more are--despite the setting not being some place you'd expect people to keep distinct breeds:
** ''[[VideoGame/{{Fallout 1}} 1]]'' and ''[[VideoGame/{{Fallout 2}} 2]]'' are the only full exceptions by merit of the in-game model and the [[LegacyCharacter original]] [[CanineCompanion Dogmeat's]] [[ character portrait]] not resembling any particular breed. The model for the [[RobotDog robodogs]], including K9, is a slightly modified version of the regular one.
** All of the non-mutated dogs in ''[[VideoGame/{{Fallout 3}} 3]]'', including its Dogmeat, look like Australian cattle dogs, a reference to Max's dog in ''Film/TheRoadWarrior''. The mutated dogs, though suffering from hair loss and some radiations burns, look strangely like pitbulls. ''[[VideoGame/FalloutNewVegas New Vegas]]'' recycles these two models, modifies the non-mutated dog model to make the [[RobotDog cyberdogs]] (including Rex), and adds in the [[SavageWolf wolf-like]] Legion mongrel.
** The generic, non-mutated dogs in ''VideoGame/{{Fallout 4}}'' are rottweilers, albeit with some [[PaletteSwap coat variation]]. Dogmeat, who has a fully unique model in this game, is a German shepherd. The mongrels and mutant hounds are [[BodyHorror far more heavily deformed]] than earlier counterparts, though still recognizably similar to dobermans and [[BullyBulldog bulldogs]], respectively.
* In ''VideoGame/{{Nintendogs}}'', and other similar dog sim games, the dogs are generally purebred.
* Dog-like VideoGame/{{Pokemon}} are usually based on specific dog breeds (Snubbull and Granbull are {{Bully Bulldog}}s, Furfrou is a standard poodle, Lillipup is a Yorkshire terrier), mythological creatures (Arcanine is based on [[Myth/JapaneseMythology the shisa]], Lucario on [[Myth/EgyptianMythology Anbuis]]), or both (Houndour and especially Houndoom are doberman {{Hellhound}}s).
* The dog anthros in ''VideoGame/StarFox'' are all purebred based.
* ''VideoGame/TheSims3 Pets'' subverts this. Most dogs are purebred but there are also some "designer dogs" available. You can also design a mutt for yourself.
* In ''VideoGame/HarvestMoonAWonderfulLife'' the protagonist finds two stray dogs at the start of the game and picks one to own. They just so happen to be a Beagle and a Shiba Inu. Carter also owns a Chihuahua that can't be interacted with.

[[folder:Western Animation]]
* One famous inversion is Charlie Dog from ''WesternAnimation/LooneyTunes''. He uses his mongrel status to claim that he's "all the good breeds rolled into one", then rattles off half a dozen breeds that he is [[TooManyHalves 50 percent of]].
* The dogs in the 2010 iteration of ''[[WesternAnimation/PoundPuppies2010 Pound Puppies]]'' are all purebred as well.

[[folder:Real Life]]
* Unless it's anything other than some type of "conformation show," most dog shows usually only allow purebred dogs to compete in them--but it's justified in that the whole point of a conformation dog show is to determine which individual dogs are the best examples of their particular breed.