Grey Shadow was a male German Shepherd dog who acted in movies between 1939-45.
My Pal, Wolf 1944
as Wolf, the dog
The Invisible Man's Revenge 1944
as Grey Shadow (uncredited)
Wild Geese Calling 1941
as Jake, the dog
Sign of the Wolf 1941
as Gray Shadow
Marked Men 1940
as Wolf - the Dog
Wolf Call 1939
as Smokey the Dog
Credits from TMDB.
