the interbreeding of the two varieties until 1993.The Smooth Collie today is considered a variety of the same breed as the Rough Collie in the United States, Canada, meaning that they can interbreed and some statistics are kept only for "Collie" rather than for both varieties individually.

A breed society, the Smooth Collie Club of Great Britain, was established in 1955. The breed was definitively accepted by the Fédération Cynologique Internationale