Muggshot is one of the Fiendish Five and a boss in Sly Cooper and the Thievius Raccoonus. Because his arms are so large and long, he ends up walking on those instead of his legs.
Muggshot was born the runt of the litter and was always picked on by the larger dogs. Because of his loneliness, he found solace in mobster movies. He loved how tough the criminals were and how they didn't take any guff from anyone. He knew he wanted to become a gangster. He spent the rest of his childhood working out, which eventually led him to become massive and tough as nails, vowing never to be picked on by anyone ever again. He became a well known enforcer and gunman, which led him to join the Fiendish Five.