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I'm sorry to hear your dog is growing old, but my friend's Pit lived a full 5 good years after the vet said he had less than a year. So you never know. When your dog stops eating, that's usualy a sign that they are in too much pain to go on. But sometimes you just have to make that horrible decision. My dog had glaucoma and was blind for the last 3yrs of his life, but we didn't put him down when he became blind because he still enjoyed life and still did plenty. It wasn't untill his eye became swolen and he didn't even want to leave the house because the wind in his eye was painfull that we had to look at his quality of life and decide it would be cruel to keep him. Chances are your other dog will be sad and lonely, don;t be too quick to get another dog, a replacement can make the greiving a whole lot worse for your dog. My dog and cat were best friends, so when my cat passed, it was a whole year before we considered adopting again, but it's different for everyone.