I am sorry you are having to deal w/this. I can't tell you what to do---every situation is different. We have a female who is basically living on love & doing pretty well w/a rare cancer. She has truly beat ALL odds. After her 2nd surgery the hospital encouraged us to "put her down" but we were not ready & felt she was not either. She was 8 + when diagnosed & will be 12 in August. She mostly eats & sleeps & rides in her stroller each night & walks for part of her strolls. She is feisty! She is bossy! As long as she continues to fight we will be right beside her. We know she has pain because sometimes she cries softly in her sleep---but she is not ready to give up. We did have a dog about her size once (she is small) who was just like her in so many ways. He was born w/liver shunt, operated successfully & developed life-long seizures. When he was about 17 we finally had to put him down but he enjoyed such a good long life of love & adoration. The seizures were hard as we never knew if he would come out of them but we have never regretted waiting until we knew he was ready to stop fighting. My advice is watch them closely & pray you will know when his time is complete. I think they mostly tell us if we listen when the time is right. Love them & make every day wonderful.