Bolt is one of the Buffypups from Pepé and Hari. His siblings are Spike, Clem, Anya, Glory, Xander, Willow, Wesley, and Buffy. Although he was born at Blair and Quince's place, Bolt was adopted by friends of Blair and Quince as a young pup and is now part of their recreational mushing team.
Because he was adopted early, he was not part of the naming of the litter and therefore doesn't have a theme name. However, as the picture shows, he shares his siblings good looks and the BraverMountain essence.