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Anime and Manga
- Gintama; Kagura's big dog Sadaharu.
- Fenrir's real form in Mythical Detective Loki Ragnarok; see below under Norse Mythology.
- Digimon Tamers Dobermon, a giant doberman pinscher digimon, accompanied by a human partner, is sent by the Digimon Sovereigns to assist the tamers in battling the D-reaper by giving them the ability to biomerge in the real world.
- Gabumon's evolved form, Garurumon, should also count.
- There's the shiba-inu dog, Gaogamon, in Digimon Data Squad.
- Seasarmon, the lion-dog digimon, and Caturamon the Dog-deva digimon.
- Spice and Wolf: Holo is a harvest diety whose true form is a very, VERY large wolf.
- One Piece featured a zombie Cerberus, and a squad of dog-riders in Enies Lobby. There was also wolf-man Jabura, and possibly Mr. 4's dog-gun Lassoo.
- Akamaru grows quite huge after the Shippuden timeskip. And don't even think about Pain's Giant Multi-Headed Dog, one of the most perfectly terrifying creatures incarnate.
- The nine-tailed fox, who was quite large when he was going around rampaging. It's interesting to wonder how large he actually is now that he's sealed inside Naruto. The one-tailed tanuki too because although tanukis resemble raccoons greatly, they're actually dogs.
- Bleach: Captain Sajin Komamura is the largest Gotei captain and a wolf. He has nothing on his unnamed ancestor, who turns out to be even bigger - to put it on perspective, the Leader is at least five times bigger than Koma himself.
- In InuYasha, Sesshomaru, his father and his mother all have true forms that are this. In parts of the manga not yet officially published in English, there is a giant mountain dog and a giant fox kami
- Moro from Princess Mononoke. Her (non-San) children are quite a bit larger than normal wolves, and are implied to be young children. She is considerably bigger compared to them.
- The second Monster of the Week in Magical Girl Lyrical Nanoha. Unlike the later Mega Neko, this erred more towards the monstrous-looking side.
- Arf and Zafira can both take on the form of wolves, though they look more like foxes when not in their puppy forms.
- Kotarou's full beast form in Mahou Sensei Negima!. The series also had a Cerberus, complete with the mane of snakes and dragon tail of the original Greek versions that most modern depictions omit. It didn't have the right number of heads, so Nodoka also theorizes that it might actually be Orthrus.
- Duklyon: Clamp School Defenders - Ineffectual villain Imonoyama uses a growth ray to enlarge the duo's beloved dog, Inuko, into a giant monster dog. Fortunately, she still retains her playfull personality and is "defeated" when an equally enlarged Takeshi commands her to shake hands with him, awwwww!
- Pluto from Black Butler, which can turn into a white haired human but keeps a dog mind. And can breath fire.
- Kaibutsu from Ginga Densetsu Weed. According to the Ginga wikia, he weighs at around 1200 pounds.
- In Natsume's Book of Friends, Nyanko-sensei's true form is a giant inugami.
- In Animal Land, wolves like Jeek's father and other canines are huge.
- Belle from Belle and Sebastian.
- Terry Cloth the Battlewolf from Toriko starts out pretty big (an adorable puppy that comes up to the main character's waist) and as the story progresses grows to truly gigantic proportions. We get a good look at a full-grown Battle Wolf in Chapter 263 which looks like it's the size of a building at the very least.
- Nurarihyon No Mago: Yura's shikigami Tanro is a massive wolf twice as tall as she is.
- Not to mention Inugami who grows to absolutely massive size when he's angry, which is most of the time.
- John Constantine of Hellblazer once had to put down a ghost-possessed bulldog the size of a rhino.
- Lockjaw from The Inhumans, though for a while he was considered an Inhuman mutated into his current form, as per John Byrne. This later got retconned into Gorgon and Karnak playing a cruel joke on the Thing.
Eastern European Animation
- Maxipes Fik: Maxipes (dog=pes) Fík, the dog hero from Czech animated shorts for children. When a girl named Ája (pronounced Ah-ya) got him as a puppy, he was normal-sized, but he grew to enormous size. He grew even bigger when he drank a barrel of beer, and Ája's father had to build a garage-like dog-house for Fík.
- King Cesar/Seesar/Shisha/Shiisa from the Godzilla movies. Maybe.
- Digby, the Biggest Dog in the World. The titular hound is a freakishly huge Old English Sheepdog who grew due to drinking liquid growth formula.
- Brutus the Great Dane from The Ugly Dachshund.
- The wolves in The Jungle Book (2016). They're at least twice the size of real grey wolves.
- Gmork from The Neverending Story.
- Pictured above: Clifford the Big Red Dog. The girl over there is his owner, Emily Elizabeth. Note that Clifford was born the runt of the litter; we're told that his growing to that size was a direct result of Emily Elizabeth's love.
- Harry Potter: Fluffy from Harry Potter and the Philosopher's Stone is a three-headed dog that is inspired by Cerberus. He is big enough to nearly fill a room.
- Orcs in The Lord of the Rings occasionally ride Wargs, which are giant wolflike beasts.
- In Black Legion Khayon's bond creature, daemon Gyre, takes a form of enormous Fenrisian she-wolf. Khayon notes, though, that she doesn't really act like a wolf.
- The Silmarillion by J. R. R. Tolkien has Huan, the huge intelligent dog (good), and Carcharoth, the huge (were)wolf (evil).
- The Dresden Files has Mouse, who starts out small enough for Harry to keep in his pocket and quickly grows into... well, this. Harry often makes jokes about the fact that Mouse is the size of a pony, ranging from calling him a "West Highlands Dogasaurus" to, "He's a mutt. Half mastiff, half woolly mammoth."
- The adults in Spot the Dog's world. At least, in the early books, and assuming the scale of their houses are one-to-one with those of the human world.
- Fully grown direwolves in A Song of Ice and Fire are the size of a pony.
- Conrad's dog Bortan in Roger Zelazny's This Immortal
"Was there ever another dog the size of a small horse, with armor plates on his sides, and jaws like a trap for bears?"
- The Ay (prehistoric wolves) in the Malazan Book of the Fallen — and Undead to boot, as they've been extinct for about 320,000 years, when the T'lan Imass decided to include them in the Ritual of Tellann, which made the Imass undead.
- The Hounds of Shadow also count. They're said to be the size of ponies, and the Deragoth, Hounds of Darkness, are supposed to be even bigger. Also, the Hounds of Light. This series sure loves its huge canines.
- There is also Ryllandaras, a man/jackal shapeshifting beast that towers over everyone around it.
- In Operation Chaos by Poul Anderson, the werewolf hero can be a 180-pound man or a 180-pound wolf.
- The feral dogs in Locksmith's Closet. Some of them are three feet tall at the shoulder and weigh about 200 pounds. Others are bigger than that.
- The lack of Shapeshifter Baggage for Lycanthropes in the Kitty Norville books mean that werewolves range from 100-pound "That's a big one." to 250-pound "AAAAAHHHHHH!!!!!!" wolves when they shift.
- In The General standard cavalry mounts are dogs bred up to the size of horses, and described as between eight- and fifteen-hundred pounds of fur, fangs and bad tempers.
- Percy Jackson's loveable hellhound Mrs. O'Leary.
- Werewolves in Mercy Thompson always gain mass when they take wolf form. This means that a human woman who weights 110 lbs turns into a 180 lb wolf while a 180 lb man turns into a 250 lb wolf. The wolf forms of characters like Adam and Charles are described as being enormous.
- This Immortal has Bortan, Conrad's dog he once found as a puppy and raised, never imagining it would grow as big as a horse — with plates at his sides and other mutations — or live for as long as thirty years and counting. If not for natural causes (mutation through radiation), Bortan would qualify as a Hellhound, and Conrad even calls him one repeatedly.
Live Action TV
- Game of Thrones: The Stark direwolves, which are an unusually large and intelligent species of wolf.
- The Big Goods of Tokusou Sentai Dekaranger and Power Rangers S.P.D. are anthropomorphic dog aliens named Doggie Kruger/Deka Master and Anubis 'Doggie' Cruger/SPD Shadow Ranger respectively. Bonus points for both being voiced by Tetsu Inada in Japan (he was Kruger's original VA, but SPD gets a Recursive Import so he's back to dub Cruger).
- Greek Mythology
- Cerberus which also is three-headed and, depending on the story, is on fire or possesses a mane of snakes.
- Orthros, the hound of Geryon, Orthros had two heads and a snake for a tail.
- Norse Mythology
- Garm like Cerberus, guards the Underworld (Hel).
- Fenrir, the son of Loki and a giantess, who bit off the hand of the god Tyr; fated to kill Odin. Fenrir in particular is enormous. When he opens his mouth his lower jaw is on the ground and his upper jaw hits the sky.
- Sköll who is fated to consume Sól, aka the sun.
- Hati who is fated to consume Máni, aka the moon.
- If you go back far enough the Valkyries rode wolves the size of war horses,
- Black Shuck, the mysterious Black Dog from Norfolk folklore, is sometimes said to be the size of a horse. Smaller than some other examples here, but still much bigger than a dog should be.
- Magic: The Gathering has Hollowborn Barghest, a very big dog. That's not dry grass it's standing in—those are trees.
- The Space Wolves of Warhammer 40,000 ride giant wolves. How giant? They can take a seven-foot-tall Viking Space Marine in Power Armor to ride and some reach the size of a Rhino, (whose carrying capacity is ten of the aforementioned Power Armor-wearing Space Marines).
- Werewolves in Werewolf: The Apocalypse and Werewolf: The Forsaken can take on five forms, including a 800 pound bipedal wolf-headed war-beast and a dire wolf that is only marginally smaller and even more nimble to make up for the lack of thumbs.
- Various forms of giant wolves (and, sometimes, other canids and vulpines) have shown up throughout Dungeons & Dragons and Pathfinder. The iconic three, which seem to show up in every setting, are Dire Wolves (regular wolves, but bigger and stronger), Wargs/Worgs (Dire Wolves with human-like intelligence and evil alignments), and Winter Wolves (Wargs that have a freezing cold bite attack and Breath Weapon).
- In Undertale: the Greater Dog and in addition the Lesser Dog. There is also the Endogeny Amalgamate, which is the largest of the dog type monsters by a considerable margin. It initially looks and acts terrifying, but in the end, it turns out to actually be a Big, Friendly Dog.
- Giant wolves in the Castlevania games.
- The Mystic Beasts in the Disgaea series are large horned canids, and seemingly a popular form of transportation, judging from some scenes in Disgaea 4. In the same game, they can become even bigger in battle if another monster merges with them.
- Orcs in Warcraft games ride large wolves too.
- The Pokémon Arcanine, which is big enough to ride around on.
- The mutated dog-boss in Fur Fighters. An unusual boss as it saw two mutated spouses instead of one. The other rode around on-top of the beast.
- Dark Souls has the Great Grey Wolf Sif. A giant wolf that wields a giant sword. In the DLC (which takes place centuries in the past), you can meet Sif as a puppy, and he's just a little larger than a full-grown wolf.
- Old Red in Professor Layton and the Azran Legacy is, as his name indicates, a huge old red-furred wolf. He's so threatening-looking that he constantly scares the town of Torrido. Which is actually completely unintended, as he merely has the Face of a Thug: he just wants to see his old friend again.
- Monster Hunter: The Zinogre a Lightning Bruiser who happens to be the only Fanged Wyvern in the series. He is a huge, fast and agile electric wolf.
- In the finale of The Wolf Among Us, it's revealed that Bigby's true form is a wolf the size of a Triceratops.
- Wally the werewolf in Zebra Girl is much larger in canine form than an ordinary wolf.
- The Sarghress from Drowtales breed extra large riding wolves.
- In The Order of the Stick, Hinjo's mount Argent is a rather oversized dog/wolf. Also subverted when Belkar gets a riding dog.
- In Gunnerkrigg Court, Reynardine's true form is that of a large fox, and Ysengrin is an even larger wolf. But it is Coyote himself who can become truly massive, towering over even Ysengrim.
- Mitzi from Rhapsodies.
- Questionable Content author Jeph Jacques is the proud owner of a Great Pyrenees, one of the huge breeds, named Shelby. Inevitably, she's appeared in his non-canon work a couple times.
- Giant dogs serve as draft animals and guard dogs in Unsounded.
- Battlepug, follows the life of a barbarian and his oversized dog, many other oversized creatures also appear.
- All Night Laundry has one. At the beginning he's big, but not impossibly big. He's been bigger in each of his appearances since due to damage to Bina's Timeline.
- Cry Havoc's werewolves become this with a full moon. They stand about 6 feet tall at the shoulder, and are capable of standing on two legs, raising their height to nearly 12 feet. Needless to say, they also weigh more than most cars.
- Quest of Camelittle has Black Fang, a creatively-named wolf puppy who can grow bigger at his own will.
- In Web Serial Novel Worm, one character, Bitch, has the ability to make dogs temporarily grow into giant, spiky monsterous forms. When she gets a wolf cub, it definitly fits this trope when transformed, particually as it transforms better than the dogs do (it's less deformed by the transformation), possibly because wolves are just better.
- Parodied with Cyanide & Happiness: S 1 E 3's Clawford The Big Blue Cat - which is a huge pain in the ass and kills the owner's mother. WHO CARES?! SHE HAS A DECIMATING GOLIATH!
- In the episode "Ace in Hole" in Batman Beyond Terry (aka Batman) is locked in the dog fight ring with a vicious gigantic mutated mastiff.
- The ghost dog in Danny Phantom has the ability to grow several size its normal height whenever its threatened. Lots of destruction occurs.
- In The Fairly Oddparents Timmy needs some enemy that would scare Catman enough to team up with his rival Crimson Chin. Cosmo has one bright moment and summons a Humongous Mecha Dog.
- In The Legend of Korra Korra's Canine Companion is Naga, a polar-bear dog so massive that she easily serves as Korra's Horse of a Different Color, as seen here. Naga's dog side is predominant. Occasionally, though, her bear side shows through, and it is scary.
- Elsewhere, in Avatar: The Last Airbender we see giant wolf in the spirit world.
- Due to the shifted scale Toby from The Great Mouse Detective qualifies. He's an ordianry pup, but all the other characters are mice.
- The titular Big Paw from Pound Puppies and the Legend of Big Paw is a giant puppy.
- Dinah from the My Little Pony episode "Pony Puppy" is in Clifford's size league.
- My Little Pony Friendship Is Magic has Cerberus, yes that Cerberus, who's the size of your average house. The Timber Wolves can also combine into one massive one and Orthros (yes, that one too) while not massive is still pretty big compared to the ponies.
- Commodore Puddles (Drakken's toy poodle who became giant via a growth ray) from the Kim Possible episode "Rufus vs Commodore Puddles".
- In Steampunk cartoon Mr. Hublot, a cute little mechanical puppy grows (somehow) into an enormous mechanical dog that is several times larger than its owner.