Please try any nearby verterinary schools, and call your local SPCA, as I am sure they will both have answers/suggestions for you. I have friends whose beloved dog became terribly sick, and they took Tucker to the Tufts Veterinary School in Massachusetts. Tucker died very quickly, but they found the people at the school very helpful, and the school ran tests to figure out why he died, which was important to my friends, as they had other dogs they worried about. I don't know what schools are in your area, but it would be a good place to start, at least.