Although Lassie is not an actual breed of dog, the fact remains that when you see a Rough Collie walking down the street, you're not going to say, "Look, there's a Rough Collie!"
For one thing, it may come across as rude, and for another thing, it may come across as weird. Not as weird recording your pet pooch going for a run on your treadmill, but there you have it.
Still, it's lovely to see this Lassie look-a-like doing the same thing we do when we're confronted with a running machine: cheat. Animals and humans, eh? More alike than we care to admit...