Heat spots are normally due to fleas. You will notice this first on their backs near their tails. Yes this can happen, even if your dog is on flea and tick preventative. You need to clean this spot and and shave the hair off the spot. Spray some Vetericyn on this spot. You can usually get this at petsmart or any agriculture type store. It is for wound and skin care. It very useful to keep around the house.
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