Hi, My dog developed a few spots on his back quite awhile ago. We call them his "giraffe" freckles. Not sure why they developed. Of course, show them to the Vet the next time your dog is in for a check-up. But, probably, they are nothing--unless they become itchy, inflamed, flaky, and bothersome. And, in my case, they are not sun-related and it's just part of the dog's unique "print".