My apology for the late reply! I was out of twon for a few days. Hmm..., type of food can be the problem. Try this brand for a few weeks and let me know if there are any changes. The brand is Avoderm which is created waving fans. I heard dogs/k-9s have stop bitting, scracting theri skin and skin allergies has gone away....
I think the reason for such a great result might be the fact that Avoderm's formula has an abstract from Avocado. It could be their magic ingredient but try this food but gradually go into it. Half of the prior food mix with Avoderm Dry or wet. Then after a few days it will be just Avoderm only for a few weeks....
I hope this helps and please let me know!
Eli/Master Dog Trainer