Here are some possibilities:
* Tricolor: Many breeds come in tricolor, which is a combination of black, white, and tan.
* Parti-color: This describes dogs with patches of different colors, which could include white, black, and gray.
* Brindle: Brindle dogs have a striped pattern of black and brown/tan. Some brindles can also have white markings, which might appear gray depending on the lighting.
To identify a dog breed based on color, you'd need more information:
* What breed is it? Certain breeds are more likely to have these colors.
* What are the specific markings? Are they patches, stripes, or something else?
* What size is the dog?
Example: If you see a large, muscular dog with black, white, and gray patches, it might be a Rottweiler, Great Dane, or Boxer. But if you see a small, fluffy dog with the same color combination, it might be a Bichon Frise, Maltese, or a mixed breed.
It's always best to ask the owner or a veterinarian if you want to know the specific breed of a dog.