What do numerous black spots on your dog's skin mean?

Many breeds of dogs have brown, white, pink or black spots on their skin. If in doubt and you are worried about it take your dog to the vet. It wouldn't hurt. All pet owners of dogs and cats should start from the head and work backwards on the body for any signs of lumps at least once a week. I do this automatically when my dogs are laying beside me and that includes my cat.