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My 7-week-old puppy has bald spots. Is it an allergy or mites?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Male

Hi! I got my dog when he was 6 Weeks old and now he is 7 weeks old. When I first got him he didn’t have any bald spots but a couple of days later I noticed that he had one and And also notice he was sweating a little bit and Friday I washed him in baby shampoo and now I noticed that he has more bald spots on his neck and back. He hasn’t been itiching and biting so I don’t know what to do could he have allergic reaction or is this normal

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3 Answers

Most Helpful Answer

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Answered By Stephanie Echols, DVM

Veterinarian

Published on July 1st, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! Thanks for also adding photos. Since I can’t see Prince McArthur up close I can’t for sure but it is possible he has microscopic mites. These mites are not itchy and not contagious but can cause hair loss especially in young puppies. I recommend taking him to a vet so they can look with a microscope and get him treatment if necessary. Good luck and kisses to Prince McArthur!

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on June 13th, 2019

    It could be from fleas, but it could also be due to mites, allergies, or ringworm. Without seeing Mimi in person, I can't say for certain. Have her seen by a vet tomorrow to get this diagnosed and treated. Best of luck.

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    Answered By Dr. Elizabeth

    Veterinarian

    Published on March 27th, 2019

    Prince and his sister need to see the veterinarian. They need to be checked for external parasites likes fleas, ringworm (which humans can get) and skin mites. It's possible they are sharing these parasites together (or have a genetic predisposition in the case of the skin mites). Until you know the underlying cause, it's not likely you will be able to fix the problem. An omega 3 fatty acid for dogs can help improve skin health but it will not correct parasitic problems. The doctor can quickly figure out if mites or ringworm are the problem. Best of luck and please feel free to post any additional questions.

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