In the series he is described as having 'an older' human face and black fur in wolf form. During his youth, Sam's father Joshua left him and his mother to fend for themselves. This factor is probably reflected in Sam's maturity for his 21 years on the earth. As for a minor downside.he once got angry at Emily and accidentally scared the right side of her face and and arm. She obviously forgave him and it is a bother to him when people stare at her.
This character is portrayed by Chaske (say chess-kay) Spencer,a native american actor.
Bella to Embry : Why would I stare ?