This, combined with extreme intelligence, can make them easier to train. (aplaceforanimals.com)
These dogs were strong, tough, dependable and willing workers, who were characterized by extreme intelligence and strong herding instincts, coupled with enormous instinct to guard and protect their premises. (vdrrottweilerbreeders.com)
He was a precocious child of extreme intelligence who read the encyclopedia for fun; not surprisingly, he was picked on relentlessly. (aeon.co)