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 0329 — Bossy, a cow
- Episodes 0524, 0590, and 0619 — Frank, a fly
- Episode 0671 — Hortense, a dragon
- Episode 0700 — Rosebud, a skunk
- Episode 0793 — Grover offers to become Oscar's pet, however it doesn't work out.
- Episodes 1001, 1055 — Freddie, a fly
- Episode 1170 — pet termites
- 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 1448 — Seymour, a hippo
- Episode 1449 — a flock of moths
- Episode 1489 — Anthony, a tiger
- Episode 1552 — Myrna, a cow
- Episode 1555 — Sophie, a skunk
- Episode 1586 — Dick and Jane, goats
- Episode 1618 — Hedda, a hippo
- Episode 1740 — hippos, who reside in his swimming pool
- Episode 1853 — Garfield, a rhino
- Episode 2269 — Moby Jane, a whale
- Episode 2971 — Jezabel, a chicken; Fred, a fish
- Episode 3664 — Portia, a rhino
- Elmo's World: Farms — an entire farm in his can
- Episode 4088 — buffalo
- Episode 4710 — chickens