Jackson can go go go all day long. He runs back and forth (between 18mph-20mph) in sprints for 30 mins straight, LOL. He also has walked up to 6 miles, but could probably do more. He also swims all summer long, about 4-5 days a week.
As far as jogging, I'd be careful with a young pup when it comes to "forced" running (i.e. he's not in a yard by himself, running freely and by choice, etc) vs. jogging with a leash. He's still growing, so you don't want to hurt his growing joints.
Know your dogs limits, caution with certain weather, give water when necessary, etc. Otherwise, I wouldn't really "limit" exercise per say, especially if he wants to keep going. It's good to start them young as a pup. Obviously, you couldn't have a 5 year old dog who's never been exercised in his life and take him for a 5 mile jog, lol, so you'd have to build up to it. But with a pup, you are starting fresh.
