I have a 2 year old American Bulldog, Bozo, that I recently rescued from my local animal shelter. When we got him he had a small ras we took him to the vet and had all of his shots and he was given a clean bill of health. Since then the rash has gotten worse. He scratches constantly. My vet says Benedryl 2x a day to see if it helps, but it maskes him so drowsy. I have tried bathing him, and also trued a hydrocortisone cream to no avail. Any suggestions?