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Mistaken For Dog
Alice has just brought home a new puppy! It's adorable at first, but Alice soon starts to notice it behaving strangely. She takes the animal to a vet, or does some research of her own, only to find that her new pet is not a dog at all.

The animal's true identity could be anything from an alien lifeform to a Mexican sewer rat. The most common variant involves the owner mistaking it for a dog, but other pet variants are possible.

See also I Am Not Weasel, All Animals Are Dogs. If another animal is deliberately masquerading as a dog, or has been disguised as one by a human, it may be Ass in a Lion Skin. When the creature is a sentient lifeform trying to pass as a dog, it's The Dog Is an Alien.

Examples

Advertising
  • Played for Laughs in a commercial for Sears Optical: A lady badly in need of glasses lets a raccoon into her house, thinking it's her pet cat.

Film
  • In Evolution, someone finds a "dog" which is actually one of the violently aggressive aliens. Hilarity Ensues.
  • George of the Jungle: To George, Shep the elephant is his "big, gray, peanut-loving poochie." And Shep seems to believe it too.
  • In Adventures in Babysitting, when Brenda has lost her glasses and is stuck in the bus station, she sees what she thinks is a kitten, picks it up... and it turns out to be a jumbo-sized sewer rat. Watch it here, at about 8:05.
  • In The Pirates! In an Adventure with Scientists, the pirate's beloved parrot Polly is actually the last living dodo.
  • Played completely and horrifyingly straight in The Thing (1982), where the characters bring a malamute home to their base camp and it turns out to be an alien bent on assimilating all life on Earth.
  • Experiment 626 of Lilo & Stitch — a genetically engineered creature from an alien planet — is an interesting case. He's mistaken for a dog by the owner of an animal shelter, who really ought to know better. (She also assumes he's dead — having been run over by a semitrailer — and yet puts him in one of the cells anyway.) And that was before he retracted his antennae, back spines, and second pair of arms. Once he has, Lilo is perfectly willing to believe he's a dog. Nani, David, and Myrtle's Girl Posse are far more skeptical.

Literature
  • In Piers Anthony's Race Against Time, one clue that tips off to the protagonist that he's living in a human zoo is that his new "puppy" climbs trees, and his "kitten" has a prehensile tail. Whether they're aliens that only look like house pets, or actual pets modified via genetic engineering, he never does find out.
  • In Howard Waldrop's short story The Ugly Chickens, a family has been raising what they think are just very ugly chickens for several hundred years. It turns out that they're actually dodo birds.

Live-Action TV
  • ALF: ALF would sometimes be mistaken for a dog, even getting thrown into the pound in one episode. He was also mistaken for a kangaroo once.
  • In Pixelface, at least two sets of visitors to the console (Uthelwynne in "Two Aethelwynnes" and Alexia's parents in "Alexia's Dinner") have assumed Rex is a dog, despite him talking to them.

Other
  • The urban myth of "The Mexican Pet" involves a woman taking her "dog" to the vet, only to be told that it's a diseased Mexican sewer rat.
  • There's the old joke that ends, "What the hell kind of dog is that?" (After said "dog" bites off the head of a German shepherd.)
    "Well, afore I bobbed his tail and painted him yellow, he was an alligator."

Video Games
  • Happens in a StarCraft cutscene: "Looks like you mashed some poor feller's dog, sarge." "It's a zergling, Lester, smaller type of zerg. They shouldn't be out this far unless... oh shit."
  • Tales of Symphonia has Noishe, who Lloyd thinks is just an oversized dog. He's actually Protozoan, a very ancient species.

Western Animation
  • In The Tick, the Tick mistakes a capybara for a dog and makes a pet of it.
  • Inverted with Ren of The Ren & Stimpy Show; most people think he's some sort of rat, though he's really a chihuahua.
  • In The Looney Tunes Show, Bugs mistakes the Tasmanian Devil for a dog.
  • In a series of Looney Tunes cartoons, Sylvester keeps mistaking the baby kangaroo for a giant mouse.
  • In the first episode of The Mighty B!, the dog Portia enters in the dog show turns out to be a rat.
  • Naturally, this sort of thing happens to Mr. Magoo all the time. One cartoon has him releasing a panther from a circus when he mistakes it for his dog being taken away by the dog catcher. In the feature film 1001 Arabian Nights, Magoo's "dog" Bowser is actually a cat, and a subplot has a ball of enchanted yarn used to make a Flying Carpet take a liking to Magoo after he mistakes it for a cat and starts to pet it.
  • Kim Possible: Kim and Ron go undercover at a dog show, entering Rufus (a naked mole rat) as a contestant. Rufus wins!
  • The Goode Family: The family adopt what looks like a diseased dog. When they take it to the vet, they discover that it's actually a rare Malaysian marsupial, whose grotesque appearance is perfectly natural.
  • On The Grim Adventures of Billy & Mandy, Billy enters a werewolf in a dog show.
  • Muppet Babies once had baby Animal mistake a FULLY GROWN DINOSAUR for a puppy.
  • On an episode of Family Guy, Peter admits that for the first few years of her life, he thought Meg was a cat.
    • In a Cold Open where they visit their new neighbors the Smiths, Peter mistakes Roger for a dog.
  • On The Angry Beavers, Dag and Norbert are adopted by a family that thinks they're dogs.
  • In an episode of Rocko's Modern Life, Rocko tries to get Spunky out of the pound, only for the officials to mistake him for a dog and throw him into a pen with other dogs.

Real Life
  • Truth in television, with sand cats often being mistaken for domestic cats.
    • A man found a baby bobcat thinking it was a kitten. At home, he realized his mistake when it opened its mouth and let out a loud baby-like wail.
    • In general, pretty much any small wild feline can be mistaken for their domestic counterparts. The worst offenders of mistaken identity are African wildcats and Europoean Wildcats, the ladder made worse by frequently interbreeding with feral stock as well being the cats' early ancestors before domestication.
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