Fang's real name was "Red".  He was owned by Rudd and Frank Weatherwax. These are the same two trainers who trained Lassie and Old Yeller. However, it was their brother Bill Weatherwax who worked Fang in the series. Red was a veteran actor and had previously worked in the TV series "Bachelor Father" as "Jasper", replacing the older dog, Tramp, who first had the part. (this Information was courtesy of "Red Wull".