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