I don’t know what breed your dog is. If the dog is not a purebred, its coat color will change as it grows up. This is okay. There is another possibility that the dog is sick, because the physical health of the dog can also be reflected by the color of the dog's coat. You also said that only the eyebrows are a little white, so the possibility of getting sick is unlikely. The author must like dogs very much, so the color is not that important.