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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

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.

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