Dogs have four legs with five-toed paws, each with a soft pad and claw. They have sharp teeth, a long muzzle, bushy tail, and erect pointed ears. Their coats of hair keep them warm, and they cool off by panting and hanging their tongues out. Dogs can vary in size from the great dane, which can weigh up to 174 lbs and be 32 in tall, to the chihuahua, which can weigh up to 6.6 lbs and be 7.9 in tall. Selective breeding has led to larger skeletons for larger breeds, smaller skeletons for smaller br