If they haven't yet, ask them to contact Tufts Veterinary School/hospital in Grafton, MA - they have world-reknowned experts. My friend was able to get answers from them and no one else when her foundling pup, a Saint Bernard mix, died suddenly within hours of acting sick at the age of three. It turned out that he had been poisoned, and they were able to tell her what kind of poison and that someone had probably put it out for coyotes (they live in a very rural area) and Tucker found it. It was such a relief for her to know, as she had two other dogs and several cats, and was worried that it might be something contagious.
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