Huh. Less aggressive? Never heard that, but cool. I handle aggression different. If it bites, it's culled. I handle my pups daily, and if there is biting, other than grooming or very scared bites (i.e.: my fault) I sharpie the base of its tail. Then when it's time to cull, or when I need feeders, the marked ones go first. Biters are not tolerated here.