He's in our prayers. Could you maybe have the vets call someone for a second opinion? My friend's dog had a rapid decline similar to that, and sadly, he died. They took him to Tufts Veterinary School, which is not too far from here - where Miss Hoppy had her thymoma treatment, and they did a necropsy and found he had been poisoned.
www.tufts.edu - 200 Westboro Road - (508) 839-5302
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