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Why is my dog's underbelly skin dark? Food change or hot weather?

Updated On September 23rd, 2025

Pet's info: Dog | Irish Terrier | Male | unneutered | 35 lbs

The skin on my dogs underbelly and penis has become quite dark over the last month or two. He is in good health and not itching. The colour change coincided with a change in his food (I have moved him onto a higher meat content dried food -70% meat), but the skin change also coincides with a spell of hot weather we have been having. Where should I go from here?

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1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on May 24th, 2018

I would recommend reverting to his original food or a hypoallergenic diet and adding some omega fatty acids to promote skin repair and regeneration. If the diet has triggered these symptoms, they should regress over 6-8weeks. If he develops severe itching, antiinflammatory sprays or gels may be required from your vet. Seasonal allergies are also very common at this time of year and tend to develop in younger dogs (usually between 6mths and 3 yrs for first symptoms)

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