A dogcatcher becomes confused over the species of Garfield, Floyd, and a dog.
Garfield walks into a pet store, trying to use it as a buffet, only to get thrown out in an alley by the storekeeper. He then encounters Floyd, who, initially not recognizing Garfield, begs for mercy. After exchanging greetings, they watch a literal rat race, followed by a dog being chased by a dogcatcher named Ralph. Ralph catches Garfield, mistaking him for a dog. The chief dogcatcher, Mr. Mendelberger, tells Ralph to put Garfield down. Mr. Mendelberger warns Ralph that, due to his incompetence, he will be fired if he makes another mistake.
As Garfield and Floyd walk away, they encounter the dog Ralph was chasing, who growls at Garfield. Garfield then barks back, claiming to be a type of dog known as a Fido Felinus (a dog that looks like a cat). The dog believes Garfield, leaving him and Floyd alone. Impressed by Garfield’s skill, Floyd is taught how to meow, which is hard for him at first. When Garfield demonstrates his ability to bark, Ralph hears it and encounters Garfield again. Convinced that Garfield really is a dog, Ralph goes after him. The chase involves some hi-jinks from Garfield when they arrive at a group of trash cans.
Meanwhile, Floyd improves on his ability to meow, which convinces the dog from before that a cat is nearby. After learning that Floyd is doing an impression, the dog shows that he can squeak like a mouse, with Floyd telling him where to improve. When Ralph, still chasing Garfield, finds the two, he catches the dog. The dog then squeaks like a mouse, followed by Floyd meowing, which only confuses the dogcatcher. When Garfield returns, Ralph catches him, declaring that he has finally caught a dog.
Mr. Mendelberger returns, reminding Ralph of his warning. Ralph tries to convince his boss that Garfield really is a dog, only for Garfield to meow when he was expected to bark. He has no luck getting the dog or Floyd to make their expected sounds. He ultimately goes crazy over which animal is which. Two other dogcatchers put him into the back of a city pound van and drive him away. The three animals initially sympathize with Ralph, then continue impersonating each other. A bird watches the trio before mooing like a cow and flying away.
- Mr. Mendelberger (voiced by Gregg Berger)