u sure have to be careful with allergies...vets often confuse something else with them...my dog leather has always chewed herself and knows the command to stop very well, but still she continues to...when taken to the vet, she was said to merely have allergies...then one day, a lump grew on her side. it stayed their for months, and we took her back often, but got the same reaction...it was just allergies...so after changing her dog food a number of times, and nothing working, we took her to a different vet...this vet was awesome, and told us that the itching and biting was a hyperactive disorder, and that the lump was not an allergic reaction, but a tumor...luckily, we got the tumor removed, but it was malignant so she will always have cancer there was nothing we could do about it, but the point is that the vet should have known that leather's allergies weren't the cause of such things (even though she does have allergies) it sounds like u have a really good vet for giving you medication and everything and i hope your doggies allergies get better!