My dog had a bad flea allergy (hair loss) but was fine.Took her to our vet who gave her cortisone, Frontline, anti-histamine plus vitamins. Next morning my poor dog had her head in the air'coughing/panting' from the inside (similar to K.cough but with no gagging).Tummy swollen and hard, restless. Phoned vet twice who said this was normal due to the cortisone and to 'hang in there'.My dog was salivating with pinkish blood coming from her mouth. She died that night.Vet did a free p.m. on her for her own information, she said. Post mortem revealed nothing.She told me my beloved pet died of stress due to the flea allergy (even though she was fine and healthy) - allergy to anti-histamine and old age !! (What - overnight???).I asked her what was all the noisy'coughing/panting' about coming from her throat and she said she did not know.What was my vet looking for that concerned her enough to do a free post mortem and never charged for the cremation. Why didn't anything show up on the PM?