Exercise is a great for dogs it is not only physically strenuous but it is mentally stimulating as well. It will make for tired happy puppies. As long as your monitoring their feet and the pads of their feet you should not have any problems with them.

 

A mile at a moderate pace is probably fine. More than that and I would caution. If at all possible, try to avoid actual concrete- grass, dirt or even asphalt is significantly lower impact that concrete.

 

I'd be careful to watch them and take breaks at the first sign of fatigue...any little thing would deserve a quick walk break due to their age, but I'm a bit paranoid. You could always call your vet and ask, too, they normally take questions like that via phone and are fine. If it's mostly on grass as you say I would guess it's fine.

 

It's probably fine, especially since it's mostly on grass. I would be a bit more careful with Boo though just because we know she's going to be on the large to giant side given her current size. Her growth plates are going to closer more slowly than Sully's and her already large size means more stress on her joints.

 

Depending on what other exercise they're getting, I'd say a mile jog on grass and dirt is fine. Definetly put effort into making sure that they spend as little time on concrete as possible though.

 

Thanks for all the responses, my major concern is the impact on their joints and bones and I actually got on mapmyrun to figure out the route that had the least amount of concrete and I figured out if I walk that first .25 mile I can make the entire jog on grass which makes me feel better.

I'll just think of it as a warm up and cool down

 

That's how it should be done! I don't think people remember that dogs need to be warmed up just like humans. It would also be a good idea to give them a good rub down (kind of like a muscle massage) after they've jogged.