Old Folks Home for Dogs
Hospice is usually an end of the life program overseen by a veterinarian to help the family manage pain and keep the animal comfortable until the end of the pet's life. BLESSING OF THE ANIMALS names a few programs and I interviewed industry leaders on the topic. Read an excerpt of Compassionate Critter Care now. There are a couple of links to pet hospice providers.
Don't forget to comment with any other sources you'd like me to include!