The Natural Bob Tail gene is another gene occurring in the Pyrenean Shepherd breed.
NBT – UC Davis (Listed for Pyrenean Shepherds)
RESEARCH & ARTICLES
Intro – Congenitally short-tailed dogs are present in many breeds; … We investigated here the presence of the T gene mutation in 23 other breeds (360 dogs, including 156 natural short tailed) in which natural bobtailed dogs exist. (NOTE: The Pyrenean Shepherd is referenced in this article.)