In 1975 when the Bonanza TV Series ended...Lorne Greene bought The Buckskin Horse whose real name was Danny, that he and James Arness shared riding in "Gunsmoke" from 1959-1973. Lorne kept him until 1979 then he donated Danny to a Therapeutic Riding Center. where the Horse taught mentally and physically challenged children to ride until his passing in 1992 at the age of 45, an unusually long life for a horse. to live.