
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. In total, there are 13 recognized credits in film. On Cinestia you can browse Lightning the German Shepherd's complete filmography — 13 films — and find where to watch each title.