While Dug, with his large hands, shaggy hair and fur tunic (the latter chosen because a naked clay torso would have made the already laborious animation process even longer) certainly looks the part of a caveman, he has more than a hint of Wallace about him too. "It's very much from Nick's design sensibilities," agrees animation director Merlin Crossingham. "Classic eyes, big teeth and kind of a nice chunky, solid feel to it. And yes, it's something that has sort of becoming the Aardman house [style] but really it's Nick's design style."
Source : http://www.latimes.com/entertainment/movies/la-ca-mn-sneaks-early-man-20180112-story.html