Lightning was a German Shepherd from a line of canine silent film stars. A grandson of Strongheart, Lightning was billed as "The Wonder Dog" and "The Marvel Dog". He began life as a runt but grew to be larger than average for the breed, and he was very intelligent. Lightning appeared in numerous movies. From Wikipedia.
1937Renfrew of the Royal MountedMovieas Lightning, Renfrew's Dog1936White FangMovieas White Fang1936Two in RevoltMovieas Lightning - the Dog1935A Dog of FlandersMovieas Leopold, 'Leo' the dog1935Wings in the DarkMovieas Lightning - Ken's Dog (uncredited)1935Man's Best FriendMovieas Lightning, Jed's Dog1934When Lightning StrikesMovieas Lightning1934The Case of the Howling DogMovieas Prince (uncredited)1927SpeedMovieas Lightning', a Dog1926Lightnin' FlashesMovieas Lightnin' - the Super Dog1926Lightnin' WinsMovieas Lightnin' - the Super Dog1925The Lure of the WildMovieas Shep the Dog1925Lightnin' StrikesMovieas Lightnin' - the Super Dog