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Why is my dog developing new brown spots on her skin and belly?

Updated On September 23rd, 2025

Pet's info: Dog | Coton de Tulear | Female | unspayed

I'm taking her to her vet in town days information I think my coton de Tulare Maltese mix has skin pigmentation. she was mostly white when we got her. Her hair started showing black undercoat but then she got pots on her skin not consistent with the hair. They are more brown and they are all different shapes and sizes all over her body and her belly is mostly covered by them. This is a picture of her the top is her and bottom is her chest. I can send more

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1 Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on September 14th, 2022

Skin pigmentation changes can occur naturally as a dog ages if there are not other underlying health issues. That said, some skin conditions and metabolic diseases as well as allergies can lead to hyperpigmentation like this. In the case of metabolic issues, the pigmentation change is usually bilateral along the hind legs, while allergies can lead to skin changes along the belly, groin, and legs. If you've already scheduled a vet visit, that's an excellent thing. Your vet will likely recommend some testing such as bloodwork to check for metabolic issues, and a skin scraping to check for parasites/infections/irritation that could be causing the pigment changes. If allergies are suspected, additional treatment such as a trial of a daily medication or food change may also be beneficial. In the mean time, if you notice any itchy or irritated areas, keeping it clean and dry can help. If Indie is licking at any spots, an Elizabethan (cone) collar can also help reduce irritation.

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