Doc, I have a 14yr old Bluetip Himalayan neutered male, who I believe has allergies. He had been on Royal Canin SO due to urine crystals, but he started getting itchy, mini pustules at the base of his tail for the last 6 six years or so. I had given him Depo shots to alleviate his symptoms over the years but now we are on a Hydrolized Protein (Royal Canin) diet. He has been on this strict diet for about three weeks now and is not getting any better (sniffling, hair loss, pustules, scratching). I changed the litter to a dust free type, exhausted all environmental allergens I could think of. I am concerned with the pustules on the base of his tail. Have you had experience with these?
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