I think this is also a Health concern, as is jogging or running with large breed puppies. Concerns over bone development and structure are common in puppies, as is duration in small dogs.
I personally don't have information to give on the subject, but I do know that how long a small dog can run, and how far, depends a great deal on the breed, as is the case with larger breeds as well. If you are seeking advice as to how to train a small dog to run, then perhaps someone can be of assistance in that area as I am not a runner.
Hopefully some of our more informed members will have experience and/or advice to share.
