At 5 1/2 months, I'm not sure I'd do any "forced" running yet. Their bones and joints are still growing, and while you don't have to wait as long as larger breeds, I'd definitely wait until almost a year old.
Running around in a backyard off leash is completely different... he's choosing to run, and when to stop, etc, etc.
But when he gets old enough, just start slow, like you would if you yourself were training for a marathon or whatever. |