Siberian Husky tails are heavily furred; these dogs will often curl up with their tails over their faces and noses in order to provide additional warmth. As pictured, when curled up to sleep the Siberian Husky will cover its nose for warmth, often referred to as the 'Siberian Swirl'. The tail should be expressive, held low when the dog is relaxed, and curved upward in a 'sickle' shape when excited or interested in something. Show-quality dogs are preferred to have neither pointed nor square noses. The nose is black in gray dogs, tan in black dogs, liver in copper-colored dogs, and may be light tan in white dogs. In some instances, Siberian Huskies can exhibit what is called 'snow nose' or 'winter nose.' This condition is called hypopigmentation in animals. 'Snow nose' is acceptable in the show ring.