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Spot on dog's back losing hair, had puss and little blood spots

candance
August 31st, 2003, 11:14 AM
I have a 10 yr old mixed breed dog that has a spot on his back that started out with puss on it and hair coming off leaving little blood spots. I started putting triple antibiotic ointment with tea tree oil on it and not it is a spot the size of a quarter with no more blood spots but the hair around it is still coming off. The ends of the hair at the roots have black clumps. There is no more puss either. Is this serious? What should I do?