I might also come off as a dick saying this, but imo you should try to preserve your dogs life as long as you can. If he's in too much pain to eat or has any other telling signs of pain, you should probably do the humane thing and put him down, but give your dog a fighting chance at least. My cat was predicted to pass away from his mouth cancer quite some time ago, but he's still fighting, eating greedily (as usual :) ), and running around. Im so glad we decided to keep him around, because there's a very slim chance he might pull through for about a year or so, and I'm hoping for the best.
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