Brian is a white-furred anthropomorphic dog. He can talk, generally walks on his hind legs (using his front legs as arms), has opposable thumbs, drives a Toyota Prius, and often acts more rationally than the other characters in the series. He is the pet dog and close friend of the Griffin family, and, although anthropomorphic animals are not a regular element of the show, Brian's human attributes receive little acknowledgment and no explanation; he is largely treated as a human character. Brian has a particularly close friendship with Stewie, and many of the show's sub-plots center around them. They are occasionally at the center of the plot, for instance in the "Road to..." episodes. Brian and Stewie have shown affection to each other several times, and in the episode Brian and Stewie, they admitted that they loved each other, not as lovers, but as close friends.