Why is my puppy losing hair on his hindquarters? Food or fleas?

Question

My 6 month old shepherd-lab mix is losing hair in his hindquarters. It's happened before after we switched food, but grew back when we switched back. His worm medicine was late this month, but he had it about a week ago and the hair loss is getting worse. I'm not sure of the name of the med (I'm at work right now), but it's a brown chewable that looks like a treat, and the vet said it would treat/prevent fleas, heartworm, roundworm, ringworm, and ticks. Pet's info: Dog | Mixed Breed Large (61lb +) | Male | unneutered | 7 months and 2 days old | 45 lbs

Jacqueline Nobles, DVM, DACVECC · Accepted Answer

From the description provided, your pet may be suffering from allergies secondary to fleas, environmental allergens such as dust, pollen, grass, or even a protein source in his diet. In addition to the food trial, it is imperative to administer the flea prevention on time every month. Even one flea bite can set off a reaction that can ultimately lead to a secondary skin infection.

Why is my puppy losing hair on his hindquarters? Food or fleas?

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