This is a pretty informative and helpful web site, even if you aren't in the Seattle Washington area for those with special needs animals that may be in their last phase of life.
In Home Hospice Care
Another resource that provides seminars and online learning about hospice care for your pets, they also provide e-mail support and some telephonic support.
SPIRITS in Transition
BrightHaven is a sanctuary, Holistic Education Center, and Rescue