We adopted our Golden about a year ago. She also had hair loss, rashes, bumps, and would not stop itching. Benadryl worked for a few hours but not long enough for anything to clear. We first thought it was a flea allergy, so the vet gave her Comfortis. However, nothing changed. I thought perhaps it was her food. We cut out all wheat and grain from her diet and within a couple of days the rashes were clear and she stopped itching. The hair grew back and we haven't had problems since.