@wylmite1986 you can transfer them to a household that you aren't playing with zero consequences.
As for pets being to needy... I think that it depends on the traits given. I have avoided some because of the needy factor. As others said an automatic feeder and a self cleaning litter box helps. I make sure to have wellness treats on hand in one sims inventory so I don't have to go to the vet for anything. Kids, toddlers, elders tend to automatically que interactions with them more than teens - adults.