I also have a puppy that itches all the time. I also took her to the vet. He gave me spectial shampoo and said to give her children's Benadryl (sp). I did both and they did nothing at all. I took her back and he said it could be her anal glands needed to be emptied. He said it was unusual for a puppy to have the glands full. Well they were. He cleaned them out--she is still itching. I am going to take her back and check on the ear mites. I feel so sorry for her. If that doesn't do it, I don't know what else to do.