The frequency of the long or woolly coat in the Siberian husky is unknown, but it is rarer than the standard short coat. It is caused by a recessive gene, meaning a dog must inherit a gene for long hair from both parents to express the trait.
The normal coat of the Siberian husky consists of a soft undercoat and a straight, smooth coat of guard hairs. A long or shaggy outer coat is a fault under the breed standard, as long hair does not shed snow properly and takes longer to dry, traits that are negatives for a working sled dog. Woolly coated Siberian huskies require much more extensive grooming than those which have the normal coat.