Purely curiosity, since ddog is 14 and his puppy days are well and truly past!
I've seen the reference to this being on-lead walks only, but does it also refer to young dogs running around on their own / with another dog? Just wondering, because ddog used to run for miles, I'm sure, if you'd actually put a pedometer on him dashing back & forth & playing with his sister (we were on a farm in southern Spain, so literally hectares of scrubland available to him). Is that not a problem, and if not why not? And come to that, how do you stop a 7 or 8 month old dog tearing around in circles & turning somersaults . . .