According to the American Kennel Club (AKC), they sport a thick double coat, which comes in both rough and smooth varieties ... Their medium-length fur showcases a variety of colors, including blue ...

From the lightning-fast Greyhound to the tireless Border Collie, athletic dog breeds come in all shapes and sizes ... weigh 13-17 pounds and stand 12-15 inches tall. They have a short, dense coat with ...