Note: I am intentionally using 'pet' a little bit elastically here.
I'd like to have a preferably furry office pet without cruelty. It would be nice to know I could have a hamster, but that bears at least two obvious objections besides eccentricity: I don't know that one could bring a hamster to work and take it home on the weekends without being cruel to the hamster, and bosses would have a legitimate concern about allergens even if there were not some rule on the books against mammal pets. I've had a Furby 2.0 as an apartment pseudo-pet before discovering uncanny valley effects, and I've kept a tribble and an electronic goldfish, and I know that some places will let you keep fish if you take care of it appropriately.
What are the closest approximations available to keeping something furry as a pet that will not run afoul of animal cruelty or bosses' reasonable concerns about what you bring to the office?