The Czechoslovakian Wolfdog (Czech: Československý vlčák, Slovak: Československý vlčiak, German: Tschechoslowakischer Wolfhund) is a wolf-dog breed that began as an experiment conducted in Czechoslovakia in 1955.
After initially breeding working line German Shepherds with Carpathian grey wolves, a plan was worked out to create a breed that would have the temperament, pack mentality, and trainability of the German Shepherd and the strength, physical build and stamina of the Carpathian wolf. The breed were originally used as Border patrol dogs but were later also used in search and rescue, Schutzhund sport, tracking, herding, agility, obedience, hunting, and drafting in Europe and the United States.
It was officially recognized as a national breed in Czechoslovakia in 1982, and was officially recognised as a breed by Fédération Cynologique Internationale (FCI) in 1989.