My cat has osteosarcoma of the left front foot. He puts no weight on it and hops around on three legs. It is quite large - I can't measure it because he thinks I'm up to something and runs away. He's an ex-feral. He sleeps considerably more than my 9 year old (who doesn't have cancer) but he does come out to the kitchen ever so often and other places in the apartment. There's a shelf over my bed that he routinely jumps up to; it's a 2.5' jump then a 3' jump to get to it. When I lay on the bed, he comes over to crawl under the covers and get scratched. His appetite is declining. I don't know exactly what he eats because I have dry kibble out for him and the 9 year old eats from that also. I give him tuna every day. All of the liquid and about a tablespoon of the tuna. He usually only eats half the tuna but drinks all the juice. I also give him canned food and he eats a fair amount of that - about 3/4 of a Tbs. He seems to be still enjoying life but I wonder how I'll know when it's time and I'm extremely anxious about it. I don't want him to suffer but I wonder how I'll know when it's getting close to that.