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Why is my dog suddenly losing hair on his neck with a bald spot?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 11 months and 10 days old | 35 lbs

Dog neck area is loosing a lot of hair. Currently has a big bold spot. Collar is nowhere near too tight. He is currently shedding a lot all over which is not the usual. Normal to light shedding usually.

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1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on April 20th, 2018

There are two possible reasons for this: 1) since he is shedding a lot anyway at the moment the additional rubbing of the collar is "helping" shed more and faster, 2) He may have a sin reaction to the collar and therefore the Hair falls out. As long as the skin looks healthy, not red, no injuries or rash present, I do not think you have to worry. You may want to take off the collar for a while to eliminate mechanical rubbing damaging the fur.

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