Thous appeared in several 1970s Westerns, including Chino, Bad Man's River (with James Mason), A Town Called Hell (with Martin Landau), Pancho Villa (with Telly Savalas), The Spikes Gang (with Lee Marvin and Ron Howard), and A Man Called Noon. Outside of the West, he played Black Dog in the 1972 Treasure Island (with Orson Welles) and was seen in the Spanish horror films Dr. Jekyll Versus the Werewolf and Hunchback of the Morgue (both with Paul Naschy).