Has any one tried to bulk up their rottie? I very intersted in draft carting .Iam ntersted in the age as to when i should start letting my rottie pull weighted carts.I as worried about bone,cartaligeand tendon strenght at younger ages. I know Not to rush into pulling heavy right away and that it takes time to build muscles. Shoot it took me three years to bench 300 plus. Any info would be a great help.& nbsp; Tom Edited by: Arcticcat