A few months ago I noticed that my dog was missing fur on his leg, but since he wasn't biting at it or seeming to be pained by it, I didn't really worry. The fur is still missing, and doesnt seem to be growing back. I will add some photos if I can figure out how, but in case I can't: the patch is mostly round, and there are little dark dots on the skin, but they don't come off with washing. He doesn't have fleas, has been vaccinated for everything under the sun including lyme disease, has not been sick or itchy before this started all the way up until now. If something had pulled out the hair, wouldn't it have grown back by now? I don't want to spend the money to take him to the vet and be told nothing is wrong...
Potential causes for circular hairloss include localized skin infection with bacteria, demodex mites, or ringworm (fungal skin infection). In small dogs with continuously growing haircoats, such as poodles, localized vaccine reactions can also cause hairloss, especially rabies vaccine. A vaccine reaction would be diagnosed by skin biopsy, and if that turns out to be the cause, then I would recommend vaccine titers (blood testing to document immunity) rather than yearly boosters, or at least using a different rabies vaccine manufacturer.
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