
I would suggest a cat as well. I know, with my dogs, they need exercise, and when I am layed up on crutches, they seem to go bonkers. But I have made the arrangements for my mom to do the exercising when I am layed up.
Toy breeds, although small, most people think they get enough exercise around the house. But that is not the case. It would be a bit different if it was the odd day here and there, that would make it harder to take them for a walk.
My sister has two cats, both rescues so I cant say a breed (since we have no idea). But her one, she has trained. It comes when called, rolls over, sits, heels, lays down when told, uses the toilet as a litter box (for real - and he can flush it too!). She has also started this cat with Cat Agility. He can do weave poles, a down-stay to five, jumps, tunnels, etc. A cat isnt limited in what they can learn. And when she gets home from work, and just wants to laze around, she can. They will entertain themselves, or they will snuggle up with her.