hey man, my family dog is just like that. we've had him for 13 years, chews his leg, alls he does is sleep, pees in the basement sometimes, when we put him out he cant make it back up the stairs and he wanders in the road, hes deaf and probably blind. hes being put down next week. It sucks because hes my dog, hes never given me shit, hes always just been like "love me play with me i wont hurt you" and now im going to have to watch him die. I would want it done to me though