Funny Cartoon Animal Logic!

 Here’s Some Funny Cartoon Logic!

• ALVINNN!!! and the Chipmunks has Mr. Whiskers, who was revealed to be a female at the end of the episode "Good Luck Mr. Whiskers", and being renamed to Miss Whiskers.
• Angela Anaconda has a terrier mix named King. It's revealed in passing that "King" is really a "Queen," so presumably this trope came into play at some point.
• Subverted in Arthur. The vet announces that the dog has had puppies, and Arthur points out that Pal is a male dog. It turns out the vet was talking to somebody else.
• The Berenstain Bears: In "The Trouble With the Pets", the cubs get a puppy and think of naming it Prince, but are informed it's a female, so they name her Little Lady. When she grows up to be quite a large dog, they rename her Lady.
• Camp Lazlo: "Lamar wasn't a Lamar, he was a Lauren!" Noticeably, Lamar is a leech.
• In a story from Charlie and Lola, Lola brought home the class guinea pig, who was called Bert. Lola insisted that Bert was a female guinea pig, even though everyone else insisted she was male. At the end of the story, Bert had guinea piglets. This story was also adapted for a book release.

• In the Doug episode "Doug's Fat Cat", Roger forces Doug to look after Stinky, his Right-Hand Cat. This leads to Doug freaking out when he thinks he's gotten Stinky sick by giving into the "tomcat's" unreasonable desires for pizza and ice cream.
• The Fairly OddParents! episode "Hare Raiser" ends with the revelation that the class pet Mr. Cuddles is actually a girl rabbit and has babies.
• Hey Arnold! has a more justified variation for this in "Das Subway", where a blind man's "male" dog gives birth when they're stuck in a stalled subway. Seeing-eye dogs are typically spayed/neutered but it isn't clear if the dog is a trained seeing-eye dog or just a pet.
• Looney Tunes:
• Subverted in the short "Little Orphan Airedale" (1947): As Porky Pig is trying to throw a freeloading dog out of his apartment, the dog begs him to be gentle because of their "condition" (and gets a sort of maternal look). As Porky relents and gently helps the dog to a chair, he finds out the dog's name is Charlie,and resume throwing him out.
• The Loud House: In "Along Came a Sister", Lincoln offers to take his 5th-grade class's pet tarantula, Frank, home for the weekend—everybody (except for Lisa Loud) thought Frank was a boy, but in the end, Lisa reveals that Frank's actually a girl, explaining that she was able to tell the spider's sex due to some markings on her back ("Frank" is ultimately renamed "Frances"). Also at the end of the episode, a spiders' nest is seen, which is implied to be Frances's because Lisa notes that tarantulas are always sluggish (which Frances had been) before giving birth.
• Martha Speaks: While Martha didn't get pregnant, she does tell a story of a time when a woman said "Here, boy" to her and she thought "Hello, I'm a girl dog".
• One know-it-all kid at the zoo in The Penguins of Madagascar spouted off penguin facts, concluding with it being impossible to tell males and females apart without a DNA test. Alice, exasperated, tells him that they have three males and one female, "The birds know which is which." Except they're shocked to find out there's a female. Kowalski does a test that determines Skipper is the female, leading her to seek out Marlene for advice on how to be a girl. In the end, it turns out the test was faulty and all four birds are male, Alice is simply wrong.
• Subverted in the Phineas and Ferb episode "Perry Lays an Egg". When the boys find the egg in question (which by the way was not actually laid by their pet platypus; it fell out of a nest on the tree and landed by Perry's posterior), Phineas responds: "Perry laid an egg! You know what this means? ...We're gonna have two Perrys!"
  
  
  Phineas: Congratulations, old boy, you're gonna be a--hey, where's Perry?
  
  
  
  
  • Happened with a stray cat on Recess—the cat was initially assumed to be a male (who the kids named "Stuart"), but after the cat gave birth to a litter of kittens, she was renamed "Stella."
    
    
    Spinelli: Stuart's a Stella!