my dog (10 yr old golden retriever) will bite his hind leg mercilessly, leaving raw, bleeding skin.
Why? Could his hips be hurting him (he is old and arthritis could be possibly causing this behavior?) He has no fleas because he is on prescription Program.
Just b/c he is on program does not mean he does not have fleas. I would have a vet look at your pet. It could be an allergy. Good luck, vetcare