My dog has sensitive skin but it was remidied by adding a little fish oil to the food and it went away. I would ask if it is the mite problem as stated above. If it is not and just a dry skin issue which makes them very sensitive by the tail like mine, I would try the oil or a higher oil content food. There are foods out there that cost less than that that should take care of it. You could also ask your vet for alternative suggestions.