Domestic dogs have been selectively bred for millennia for various behaviors, sensory capabilities, and physical attributes. Modern dog breeds show more variation in size, appearance, and behavior than any other domestic animal. Dogs are predators and scavengers; like many other predatory mammals, the dog has powerful muscles, fused wrist bones, a cardiovascular system that supports both sprinting and endurance, and teeth for catching and tearing.The coats of domestic dogs are of two varieties: “double” being common with dogs originating from colder climates, made up of a coarse guard hair and a soft down hair, or “single”, with the topcoat only. Breeds may have an occasional “blaze”, stripe, or “star” of white fur on their chest or underside.
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