my heart is breaking for you. It is a very hard situation. I found out my boy, Loki, had leukemia 2 weeks after my dads funeral and one week after I had gall bladder surgery. I was told to love him every day and expect two weeks. He hung on almost two years. He was MY dog, my husband knows that he was a momma's boy. (Even with a family you can still have YOUR dog.) During his last months we lost another dog suddenly to hemangiosarcoma and I was diagnosed with breast cancer. I think he felt he had to help us through loosing our 6 year old hound suddenly and be there for me through surgery and chemo. Loki told us it was time the week before I went back to work after chemo. Fezzik will tell you when, and it will be the greatest gift you can give him. As the human companion we owe this to our pups. Hard for you, but what he needs. Hugs to you and Fezzik