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.

Other pets

In Episode 0590 and Episode 0619, Oscar has a pet fly, Frank.
In Episode 0793, Grover offers to become Oscar's pet, however it doesn't work out.
In Episode 1266, Oscar owns a whale named Moby Richard.
In Episode 1269, Oscar keeps a cow named Chloris.
In Episode 1441, Oscar feeds multiple cows, horses, chickens and pigs in his can.
In 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.
In Episode 1740, he mentions he has hippos in his can (who reside in his swimming pool).
In Episode 2971, he's seen with a pet cow (Esme), chicken (Jezabel) and fish (Fred).
In the Elmo's World installment on Farms, Oscar reveals that he has an entire farm in his trash can.
Similar to a pet, Oscar builds Charles the Robot to follow his every command.
Moby Jane, a whale mentioned in Episode 2269
Portia, a rhino [citation needed]