My life , i had to change my life cuz i was 2 dumb <| sep |> I always thought that they should have all the small ppvs on the network but have the big 4 be ppv only <| sep |> I believe one of the reasons that you ' re not supposed to take puppies for runs is that they need to smell and explore to develop their sense of smell . You mentioned that they would be running off leash so that would allow them to stop and smell things they fancy so I doubt that would be a problem . However I am no vet but muscles that are still growing may be another reason you ' re advised not to run before 1224 months . I took my dogs running for the first time when they were exactly 12 months old and they managed 59 km with no problem .