I am quite certain that the dogs toured with the trainer and / or production personnel back in the time period. I remember receiving a B & W photo of the German shepards. This was in Winnipeg where I grew up, must have been around 9 or 10 at the time. I guess they did not hide the fact that more than one dog was used in the series. Of course, details are now sketchy after all of these years but the location was almost without a doubt the Eatons store downtown.
Yep. They used one dog in the original 1958 film "The Littlest Hobo". That GSD was the original London, and he served in another, albeit his last film titled "My Dog, Buddy" in 1960. He passed in 1961 at the ripe old age of 15.

You can watch all seven parts of this film on YouTube.
For the 1963-1965 series, Chuck (owner & trainer of his GSD's) used two Dogs; London #2, and Toro.
For the second (more well-known) series, Chuck used 4 Dogs; London #3, Toro #2, Bo, and Thorn. All were Male GSD's.

(Not mine; I snatched this off the FB Fan page)
At one point he had 7 GSD's: Those three males (London #2, Toro & Thorn), including two Males, Lance and Litlon (Little London), and two females: Venus and Roura.

If memory serves correctly, these were the two female GSD's.

There is vastly more to this than I would be willing to speak of. But nowadays, these GSD's with the unique "Reverse Mask" markings of Eisenmann's come at a very pretty sight, and are believed to be extremely rare, though if you do come across an authentic example.
There are, however, Shiloh Shepherds which are based off the roots of that of Eisenmann's dogs, though they don't have the same unique "Reverse Mask" facial markings.
Currently I am watching Season one of the second series. I do find it can have cheesy acting and laughable scripting at times, but it's still certainly much more watchable (and enjoyable) than a "Reality" Television Show from today
