A scientist switches the minds of a dog and a cat, granting Jerry with a cat who thinks it's a dog. Tom tries to catch Jerry but is confused why Jerry's companion is not helping Tom.

Everytime Jerry rings the bell, Butch the dog will come save him from Tom. But this isn't the case anymore when a law passes that dogs will always be on a leash.

Tom teaches Topsy how to catch mice, but Topsy doesn't think Jerry deserves to be caught.

Despite being enemies, Tom and Jerry promise to be friends and help each other keep Dorothy safe from harm.

Jerry runs an academy for outwitting cats, and is teaching Tuffy the ropes.