My boy suffered from the same problem for about 3 months.
I was back and fourth to the vets but nothing was working.
So i did a little bit of reasearch and found a website that sold Hypoallegenic dog food.
Spoke to the very helpful people in customer service who put me onto there fish and potato food that has an ingredient for allergies.
I now have a very happy healthy dog, problem all cleared up.
Hope this helps.
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