My dog keeps chewing her back leg, there are 5 or 6 bald, flakey spots, some are red and scabbed over. She has been to the vets 3 times, tested for fleas and mites and none were found, she was given antibiotics on 2 occasions and each time the itch has come back. We bath her 2 - 3 times a week with medicated epi soothe shampoo from the vets, we have tried giving her coat conditioner (recommended for dry, itchy skin) and itch stick (leaves bitter taste so she won't lick). She also wears a cone when alone and at night time, we have not changed her food and there is nothing else new in the house which may bring it on. The vet suggested eczema but i dont know how to treat that. Obviously the vet bills are topping up now and i'm running out if ideas, any suggestions??