- In Episode 0793, Grover offers to become Oscar's pet, however it doesn't work out.
- 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 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.
- Stinky, a seagull later seen in Episode 3132
- Moby Jane, a whale mentioned in Episode 2269
- Portia, a rhino
- Chickens, (one named Henrietta)
Community content is available under CC-BY-SA unless otherwise noted.