s itch persists despite strict flea control every month, antibiotics, antihistamines and the OTC hypoallergenic diet, then the potential reasons would be a yeast skin infection, microscopic skin parasites such as cheyletiella,
food allergy unresponsive to OTC foods (many
food allergic
dogs require prescription foods such as Royal Canin rabbit/potato, and the key is to give nothing else but water since it only takes one bite of a non-hypoallergenic food to ruin the diet trial), or a different al