my dog is almost 12 and is showing signs of old age,he has been throwing up his food,and some times he won’t eat at all.I’m a bit worried that he may have cancer or maybe he is just to old and ready to cross over and i’m trying to keep him longer because we are moving into our own home and I’m hoping he gets to go and have this big back yard to play in.I have had so many dogs in my life time and most of them life to be 12 and i hate to have to put him to sleep,but I can’t see him in pain just because i don’t want to go throw more heart ache.he will be our last dog.I can’t go through more heart ache with another dog.I guess what i want to know is when is a dog to lod to live any more?