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This is Dr. KV. Has your dog recently been shaved in this area or vaccinated recently? These are two possibilties where I have seen this unusual hair color and texture change.
If the patch is new, I would ask your vet where the vaccinations were administered. This has been the most common reason for this change, in my years of experience. If it does not line up with where the vaccinations were administered, then you are right...it would only be at the local site of injection.
Can you upload a picture by chance?
Yes, good pictures...give me just a moment to take a closer look...
This is interesting...I have seen coat color changes such as this in young dogs under 5 years of age, so it could very likely be a pigment change with no actual disease process or skin disorder. Some dogs continue to have skin and coat changes, especially if you see blotchy dark pigment in the mouth and inside the ear flaps.
Almost all the dogs that I have seen with these unusual changes have been doodles (poodle mixes).
You're welcome. If this is the site of a vaccine, it usually is not a concern, nor does it progress.
Very cute pooch!
Please feel free to reach out if I can offer further assistance.