I am so sorry you are going through this & I feel sorry that Ollie has to go through life in pain from this horrid surgery. He might be better off as a only
pet (cat or dog) in a relatively quiet household. Even then he probably should have daily does of pain killers. Not a ideal life but his future was decided for him
by his former family's decision. I would reject the idea of making him live outside. He has no defense except his teeth & that's no match against other bigger
animals.