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Anime & Manga
- The episode of Pokémon where a bunch of kids get accidentally hypnotized by a Hypno into thinking they're Pokémon.
- There's also one where Ash gets hypnotized into thinking he's a Bulbasaur.
- Princess Mononoke's San, who adamantly believes she's a wolf and even wears a wolf pelt to look the part. Justified, since she was literally Raised by Wolves after her birth parents were caught intruding in Morro's forest and abandoned San when she was an infant to save themselves.
- Sket Dance: Distracted by a cat while hypnotizing himself, Tsubaki started acting like a cat. It took some time before he stopped meowing.
- Ranma from Ranma One Half has an extreme fear of cats. If he is isolated with a cat in a very small space, or when he can no longer cope with his fear of cats, he begins behaving like a cat himself and becomes a master of the "Cat Fu".
- Shokora in little-known anime Massugu ni Ikou is a dog who believes himself to be a human. He's eventually convinced by the other dogs that this can't possibly be the case... so by the next time they meet him, he's switched to believing that he's a cat instead.
- Kaori Yuuzaki does this in The World God Only Knows, sniffing to find the scent of a perfume she tagged someone with earlier. However, considering her personality, in context it is creepy as hell.
- In Ore No Nounai Sentakushi Ga Gakuen Love Come O Zenryoku De Jama Shiteiru, Chocolat acts like a dog at times. She instantly obeys orders to "fetch", "shake", "sit", etc.
- In Beetle Bailey, Beetle once hypnotises Sarge to think he's whatever he secretly wants to be, making him act like a lion. He also accidentally affects General Halftrack, but he doesn't "become" an animal: "Have you gone mad! I'm an airplane!" (Paraphrased.)
- In Calvin And Hobbes, Calvin can transmogrify himself into any kind of animal, but from his mom's perspective he's always shown as a six-year-old boy. This is particularly evident in the arc where Calvin believes he's stuck as an owl.
Films — Live-Action
- Big part of The Animal.
- The framing joke in Annie Hall is about someone like this.
I thought of that old joke, y'know, the, this... this guy goes to a psychiatrist and says, "Doc, uh, my brother's crazy; he thinks he's a chicken." And, uh, the doctor says, "Well, why don't you turn him in?" The guy says, "I would, but I need the eggs."
- This is the overall theme of the early Nicolas Cage movie Birdy, in which Cage's friend believes he's a bird after nearly being killed at war.
- The forgettable French comedy movie Didier is about a dog that's somehow turned into a human, but keeps a dog mind and Hilarity Ensues.
- In High Anxiety, there's a mental patient who thinks he's a cocker spaniel.
- In The Killer, near the closing shootout of the movie, a dying Fung Sei tells Ah Jong that he doesn't know whether he's a human or a dog anymore, which may be a sign that he's close to (or has already crossed) the Despair Event Horizon as a result of the monstrously cruel No-Holds-Barred Beatdown he received at the hands of Wong Hoi, who repeatedly likened poor Sei to a dog during the beating.
- Monty Python: the Silly Olympics includes the 3,000 Meter Steeplechase for People who Think They're Chickens.
- This was a subplot in The Tracey Fragments, with Tracey's brother acting like a dog.
- Wild Wild West. Artemus Gordon uses a spinning spiral disc to hyponotize General "Bloodbath" McGrath. He tells McGrath that he'll be Gordon's "little doggy" and commands him to speak. McGrath makes dog sounds, and Gordon tells him to speak in words. McGrath starts growling angrily and Gordon notices that his disc has stopped spinning. McGrath then attacks Gordon while growling and snarling at him.
- The Disney film You Lucky Dog has a dog psychic played by Kirk Cameron who ends up inadvertently chanelling the personality of a rich man's St. Bernard whenever he gets excited.
- In the sequel of the live-action 101 Dalmatians, there is a parrot who thinks he's a dog.
- In The Three Stooges short "From Nurse to Worse", when Curly feigns insanity in order to defraud an insurance company, his apparent madness takes this form. Things get a bit out of hand when he bites the doctor examining him.
- At least one joke goes something like this:
Two cows are grazing in a field. First cow turns to the second and goes, "You hear about that Mad Cow Disease that's been going around?". Second cow looks over and says, "Yup, makes me glad I'm a penguin.".
- Of course there's the classic:
Man: Doctor, you gotta help me. My son thinks he's a chicken!Doctor: Why did you take so long to tell me?Man: I needed the eggs.
- Another involves a man who keeps thinking he's a dog going to see a psychiatrist. Upon being told to lie down on the couch, he objects: "Oh no doc, I'm not allowed on the furniture".
- King Nebuchadnezzar from The Bible.
"Despite many threats, Granny Weatherwax had never turned anyone into a frog. The way she saw it, there was a technically less cruel but cheaper and much more satisfying thing you could do. You could leave them human and make them think they were a frog, which also provided much innocent entertainment for passers-by."Magrat: "I always felt sorry for Mr Wilkins...It was so sad watching him try to catch flies on his tongue."
- This is a specialty of witch Granny Weatherwax.
- The Wee Free Men also has a toad who wonders if he's a man turned into a toad or a toad cursed into believing it. The former is true.
- Inverted in Witches Abroad, where Lady Lilith has given a wolf human thoughts to make the Little Red Riding Hood story come true. This drives the wolf mad, and he allows the woodcutter to cut off his head.
- Teppicymon XXVII from Pyramids occasionally convinced himself he was a seagull and would "perch" atop walls and pillars, which could cause a bit of social awkwardness when people saw their pharaoh and living god act that way.
- Several characters in Edgar Allan Poe's "The Celebrated System of Doctor Tarr and Professor Fether".
- In The Hallowed Hunt, a sorceress-divine of the Bastard's Order is insulted by a passing guard, and she makes him believe he's a pig for a few hours.
- Played with on How I Met Your Mother when the others point out that Robin's new date is basically a dog. While he doesn't act like a dog, his behavior is reminiscent of one (running after a squirrel, chasing his "tail", etc).
- In Misfits, one person gains this as a superpower. They go through bouts of thinking they're a Jack Russel, but don't shapeshift.
- In one episode of 3rd Rock from the Sun Harry's pet from back on the homeworld tracks him down on Earth; the pet is transformed into a human (Bill Irwin) but acts like a dog.
Tommy: Oh, good. This'll help us be less conspicuous.
- They cover by saying he took a bullet to the brain for Harry in "that war."
- On one episode of Small Wonder Vicki hypnotized several people to act strangely, including making one man think he was a dog to the point that he almost relieved himself on a fire hydrant.
- Invoked in an episode of Remington Steele; they need access to a woman in a mental ward, so Steele pretends to be this to get in.
- The Horrible Histories potrayals of George III usually have him thinking he's a kangaroo.
- In an episode Roy, Roy (who is a living cartoon) gets a blow on the head while pretending to be a dog and starts believing that he is actually a dog, to the point of growing a tail and dog ears.
- In the Supernatural episode "Dog Dean Arternoon", the potion Dean takes in order to communicate with a canine witness makes him act like a dog.
- In the Halloween Episode of Thats So Raven, the audience is shown a Halloween night where Raven and Chelsea are magically transformed into cows, but it's revealed at the end it was all a vision that Raven had that she was able to prevent.
- Rizzoli & Isles: In "Bite Out of Crime", the only witness to a murder has suffered a psychotic break and thinks he's a wolf.
- Chakotay from Star Trek: Voyager has sometimes mentioned his senile grandfather, who believed that he could turn into a wolf.
- The first verse of The Bonzo Dog Band's Spoken Word song Rhino Cratic Oaths:
After his second wife passed away, Percy Rawlinson seemed to spend more and more time with his Alsatian Al. His friends told him: "You should get out more, Percy, you'll wind up looking like a dog, ha ha!" He was later arrested near a lamp post. At his trial some months later he surprised everyone by mistaking a policeman for a postman and tearing his trousers off with his bare teeth. In his defense he told the court, "It's hard to tell the difference when they take their hats off."
- In Playing Doctor by Billy Van Zandt and Jane Milmore, one of the characters, a hypochondriac, is "diagnosed" with Talbot Syndrome as a throwaway line to get rid of him. The "doctor's assistant" later reads out the definition of the syndrome to the hypochondriac and his family. "A psychological disorder in which the patient takes on characteristics of a dog. In extreme cases, that canine mind overtakes the human mind and... the patient irreversibly becomes a living dog". Hilarity Ensues.
- In The Order of the Stick, Haley uses a potion that increases her ability to bluff to the point that she can make anyone believe practically anything. Amongst other Blatant Lies, she deals with one guard by convincing him that he's a wallaby, causing him to irately hop off to find a wizard to undo the spell.
- Inverted in Skin Horse with Phil the Mynah, an Uplifted Animal who thinks he's human.
- In the Looney Tunes cartoon "Hare Brush", Elmer Fudd thinks he's a rabbit. He gets put in a mental institution, where he escapes, leaving Bugs Bunny in his place. Bugs gets convinced by the psychiatrists that he's "Elmer J. Fudd, millionaire. I own a mansion and a yacht." He then goes rabbit hunting, and Elmer is the rabbit he's hunting. Ultimately subverted, though, as Elmer!Bugs gets arrested for tax evasion. Elmer knows he's not a rabbit; he's faking it so he doesn't go to jail.
Elmer: I may be a scwewy wabbit, but I'm not going to Owcatwaz!
- In the Series Finale of Pound Puppies (1980s), the stress of running the pound (and inability to escape it, even when on an attempted vacation) eventually broke the evil aunt Katrina Stoneheart, causing her to conclude that maybe she was a dog, too.
- An episode of the reboot had dog catcher McLeish hypnotized into believing he was a dog, while retaining his human memories.
- Jackie Chan Adventures: One episode had Evil Brit Valmont spray Uncle with a gas that causes amnesia. Valmont says, "Fare thy well, you old goat!" Uncle, who was wondering who he was, said, "Oh! I am a goat!" So he starts walking and running around on all fours, nibbling on stuff and bleating!
- Rat King from Teenage Mutant Ninja Turtles thought he was actually a rat.
- A gag in the My Little Pony: Friendship Is Magic episode "Read It and Weep" involves barking dog noises during a chase, which turn out to be coming from a mental patient pony (known to fans as "Barking Mad" or "Screwloose") who escaped from the hospital.
- Big Macintosh ends up in on this when Discord has his way with the town of Ponyville in "Return of Harmony, Part 2".
- In The Simpsons softball episode, one of Mr. Burns' team of ringers is hypnotized into thinking he's a chicken. He continues to think he's a chicken for the rest of the episode.
- Papa Smurf and Gargamel were both given magical delusions of doghood in an episode of The Smurfs.
- Happened on one episode of Monsters vs. Aliens, thanks to some Applied Phlebotinum. Sqweep wants a puppy, so B.O.B. volunteers to act as a dog for him, but can't get the behavior right. To remedy this, Sqweep makes a device to alter B.O.B.'s brain waves; but as B.O.B. has no brain to speak of, the ray just goes through him and ricochets all over the base, making everyone else think they're dogs.
- The Tex Avery-directed Walter Lantz short "Crazy Mixed-up Pup" is about a man and his dog who are run over and treated by paramedics, who accidentally got human and canine plasma switched. When the man returns home, he starts exhibiting dog behavior, while the dog stands on his hind legs and talks. In the end, the same thing happens to his wife and her dog.
- Happened to Rocko in Rockos Modern Life, where his friends, Heiffer and Filbert, used a hypnotism kit from the mail to make Rocko act like a rooster, a statue, and finally a dog. Before they have the chance to return him back to normal, Rocko escapes outside. While chasing a streetsweeper, he gets swept under the vehicle which tears off his clothes and makes his fur shaggy, fooling his neighbor Bev Bighead into thinking he really was a dog and adopting him as her pet. Even her husband, Ed Bighead, doesn't make the connection that the new pet is his hated neighbor next door, and merely regards him as an annoying pest. Fortunately, Rocko returns back to normal at the end of the episode.
- The Garfield Show: Odie once did this to an entire town in "Dog Days", when an alien gave him a self-replicating alien cookie as gratitude for finding him marshmallows. Said cookie had a side-effect on Odie wherein every person he licked starts acting like a dog, and when the affected person licks someone else they act like dogs too. Basically it was the dog version of The Virus.
- Actually a real mental illness, called clinical lycanthropy. Also the real explanation for lycanthropy, according to several authorities of the 1600s. Of course the arrested man hadn't turned into a wolf, he just thought he had◊.
- According to a persistant rumor, Confederate Gen. Richard S. Ewell had occasional delusions that he was a bird.
- There is a (false, fortunately) urban legend about a man who, after taking a massive amount of LSD, became convinced he was an orange. Permanently.
- Many cultural/religious/etc. beliefs thought that simply wearing the pelt (though sometimes bones as well) of an animal would cause you to take on the traits of that animal. In fact, the term "Berserk" comes from an ancient belief that wearing a bear pelt would cause you to transform into a bear.
- "Pet Play", a subset of BDSM, where the submissive acts and is treated like an animal (usually a cat, dog or horse).
- Feral children who have been raised by dogs will exhibit canine behaviour, even after they have been properly civilized.
- Inverted with birds that were raised by humans. There's a story about a female bird that developed a preference for tall, dark and handsome men, such as the man who had raised her. They had to get such a man to woo her with mating dances and the like, so that they could get her artificially inseminated. (It was a rare species, that's why they actually did it). While it is not known whether she thought of herself as human woman, this is very likely.