[fogebotom]

I would liken it to a weekend warrior--if you just did gentle walks around the neighborhood yourself then went out on the weekend and played a full game of football, soccer, rugby or what not. I know I always feel stiff and over exerted.

Or like the first time I do a full fledged trail ride with the horses, I feel it for days afterwards. If I slowly work myself up to a longer and longer ride in weeks prior, then I can not suffer as much after the big one.

Actually, I need to find the link, but they say unless there is a reason to train stamina in your dog, the first 15 mins or so of play for a dog is the most benefical to them-the rest is just icing on the cake.