Why is my dog's belly turning darker? Is it normal or allergies?
Updated On September 23rd, 2025
Pet's info: Dog | West Highland White Terrier | Male | unneutered | 5 months and 3 days old | 12 lbs
My west highland terrier’s belly has recently starting turning a darker color. He doesn’t itch or seem irritated at all. Just wondering if this is normal or possibly allergies?
3 Answers
Most Helpful Answer
Published on March 16th, 2018
The pictures look like it could just be normal pigment change. As puppies mature their pigmentation can as well. If the skin is raised, thicker, crusty, or itchy then I would be concerned. If you have any concerns then I would encourage you to have him evaluated by your veterinarian. If there is a concern then a biopsy could easily be done at the time of his neuter. Best of luck and thank you for using Pet Coach.
4Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on July 23rd, 2017
Hi, thanks for using Petco Pet Education Center, formerly Petcoach! I usually see the hyperpigmentation or darkening of the skin as a progressive sign of skin disease or allergies. These dogs are usually licking or scratching or have had episodes of skin infection. You didn't indicate how old Bailey but maybe if he is older you will see signs of allergies as the seasons pass. But some pigmentation can be normal. There isn't a website but you can sign up for a consultation and share photos.
1Pet Parents found this answer helpful
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Published on January 23rd, 2017
Older dogs can get lumps and wart-like growths. Many times they are benign, however it's impossible to tell for sure without doing some testing. Usually we have to take a needle and extract some cells from the lumps, then examine them under a microscope in order to make a diagnosis. Once we know that, we can decide whether the lumps need to be removed, or if it's OK just to monitor them. As for the skin discoloration, if he's not itchy (sometimes excessive itchiness can cause the skin to darken) it may just be a normal pigmentation change associated with aging. But I would have your vet take a look to make sure.
1Pet Parents found this answer helpful
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