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Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
There are 2 causes for this. One is that the collar is irritating that area causing the hair to fall out. Even if there is no evidence of any irritation, the collar may be doing this even though it may not be tight. Try another form of collar that has a different material. The other possibility is that, if Marty is neutered, they can get a condition called Hormone Responsive Alopecia. This means that the lack of long term testosterone has affected his fur and is causing this. This can be treated with hormones but since it is only around the neck, this may not be required. Your vet would give a long acting steroid injection or other hormones that will cause the hair to return in the areas affected. This is not serious condition and will not cause Marty any harm if left untreated although he may get more areas affected.Does that make sense to you?
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