My dog is 19 years old. He wanders around the home and just stares at people and into space. He started a few months ago being incontinent. When he eats he usually throws up. He sleeps 23.5 hours a day. He does not seem to be in pain but I can tell he walks funny. When I feel him he feels very skinny. He runs into everything and will just fall over. Is it time? What should I do? Vet said if I bring him there most likely they would put him down. Is that best?