The Polish Tatra Sheepdog, which sometimes goes by the Owczarek Podhalanski and the Polish Mountain Sheepdog, is a breed of dog introduced into the Tatra Mountains of Southern Poland by Vlachian (Romanian) shepherds.

The breed was very popular among mountain workers for several centuries, and up to today. It was so popular because, as its name implies, it was a fantastic sheepdog.

Herding sheep was not the only job the breed could perform. They were often used as personal guards and frequently guarded factories and other private property.

Centuries ago, as their reputation as excellent sheepdogs spread, the breed spread slowly across Europe. In 1980, an American Foreign Service Officer enjoyed the breed so much that he had three of them shipped to America, and by 1981 the breed also spread to Canada.

https://www.wikiwand.com/en/Polish_Tatra_Sheepdog