When the Pony Pals find a stray cat, they let him stay in Dr. Crandal's animal clinic until they can find him a good home, but when the clinic catches fire, the cat disappears and the Pony Pals have to find him before he gets seriously hurt.
The Space Canine Patrol is sent to find the Phanty-Cats, after they escape from the Phantom Zone, but finding them will not be easy because the cats are invisible.
When his father disappears near the Mexican border at the end of the Civil War, twelve-year-old Tyler decides to go after him and bring him home, acquiring on the journey a strange dog which he names Bigger.
In Paris, France, Minnie, a long-haired teacup chihuahua who loves to dress up, gets separated from her fashion-loving owner, Francoise, at a fashion show.