Siberian Huskies are strong, compact, working sled dogs. The medium-sized head is in proportion to the body, with a muzzle that is equal in length to the skull, with a well-defined stop. The color of the nose depends upon the color of the dog's coat. It is black in gray, tan or black dogs, liver in copper dogs and flesh-colored in pure white dogs. The medium-sized, oval-shaped eyes are moderately spaced and come in blue, brown, amber or any combination thereof. Eyes can be half blue and half brown (parti-eyed), or dogs can have one blue eye and one brown eye (bi-eyed)