We have a beautiful 20 year old boy who the vet has confirmed is in renal failure and probable cancer. He's not in pain nor making messes. He's still naughty (:-)) but his face is sunken in and he's lost half his body weight. We are administering antibiotics 2x/day indefinitely. When is enough enough? We just lost a Maine Coon baby (9 years old) in November. I feel like I'm going crazy.