The Portuguese Water Dog is a breed of dog. It is classified as a working dog by the American Kennel Club. It is classified as a working dog by the American Kennel Club. Their non-shedding qualities have made them more popular in recent years. Their non-shedding qualities have made them more popular in recent years. From the Portuguese Water Dog Club of America Revised Standard for the Portuguese Water Dog come these descriptions of the two coat types: In the lion cut, the hindquarters, muzzle, and the base of the tail are shaved, with approximately 1/3 of the tail hair left long, also known as a flag, and the rest of the body is left full length. This traditional cut originated with the fishing dogs of Portugal. The lion cut diminished the initial shock of cold water when jumping from boats, as well as providing warmth to the vitals. The hindquarters were left shaved to allow easier movement of the back legs and the powerful, rudder-like tail.