When I pet him he would scratch his back leg fierce anywhere I touched him when he normally never does, even between his eyes and the side of his nose.
My vet said this time of the year he is flooded with dogs that have allergies just like his, if you haven't changed his food recently is most likely a mold/pollen environment problem. My dog got one allergy shot and in 1 day he was as happy and playful as could be. I had to kick him out of our bedroom because his scratching and licking all night drove us nuts. Now he sleeps through the night without a single move.
I recommend getting a shot and seeing if it stops over the winter. If it does it will save you a lot of money in food costs when it isn't really the problem.
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