Why does my dog have a bald spot on his side after flea treatment?

Question

My dog had fleas recently after staying at a friends house who had a plethora of animals. After a few flea baths and a new flea collar the infestation is gone. But now two weeks later A bald spot is accumulating on his side. It's not completely bald yet but it's definitely thinning and growing in size. Any idea what this is? Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 3 years and 7 months old | 55 lbs

Kevin Sanada, DVM · Accepted Answer

There are many different reasons for bald spots, but considering your recent battle with fleas, there's a good chance it was due to that. The hair coat can sometimes look worse before it gets better, since the old damaged hair is falling out and the new hair is growing in. If the skin in the bald spot is not red or crusty, then it's likely healthy skin. You may also look closely to see if new hair is growing in - that's a good sign that all is well. If the skin is looking red and/or crusty, then it may be an infection. These can be caused by bacteria, fungus or mites. A veterinarian will be able to diagnose the cause through an exam and certain tests. I hope this helps and Sam gets his hair back soon.

Why does my dog have a bald spot on his side after flea treatment?

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