This photo is shared by the Health is a Choice Facebook page. This photo was taken in the Hortobágy region of Hungary. The cattle are an ancient Hungarian cattle breed called Magyar Szürke or Hungarian Grey.
About the family of Livestock Guardian Dogs...
“To this day flocks are guarded in the hills of Asia, Europe and Africa by powerful, robust dogs that are neither clumsy nor pacific. Despite the distances that separate them these breeds have much in common, and the Kuvasz is a member of this extended sheepdog family.”
From: Dr. Buzády Tibor, Dogs of Hungary, trans. Bernard Adams, Budapest, Hungary: Nóra Kiadó, 2002, p. 90.