Oscar's pets

Over the years Oscar the Grouch has had many pets. His diverse menagerie includes various dogs, a cat, a pig, several elephants, and a donkey. His favorite pet is his worm, Slimey. Similar to a pet, Oscar builds Charles the Robot to follow his every command.

Other pets

Episode 0590 and Episode 0619 — Frank, a fly.
Episode 0700 — Rosebud, a skunk.
Episode 0793 — Grover offers to become Oscar's pet, however it doesn't work out.
Episode 1266 — Moby Richard, a whale.
Episode 1269 — Chloris, a cow.
Episode 1441 — Oscar feeds multiple cows, horses, chickens, and pigs in his can.
Episode 1449 — Oscar tells Telly and Susan that he has a whole flock of moths in his can, which he gives holeless shirts to munch on.
Episode 1489 - Anthony, a tiger
Episode 1552 - Myrna, a cow
Episode 1555 - Sophie, a skunk
Episode 1618 - Hedda, a hippo
Episode 1740 — Oscar mentions he has hippos who reside in his swimming pool.
Episode 2971 — Esme, a cow; Jezabel, a chicken; and Fred, a fish.
Elmo's World: Farms — an entire farm in his can.
Episode 2269 — Moby Jane, a whale (mentioned).
Episode 3664 — Portia, a rhino