The Guard Dog is a hostile version of the Dog introduced in Robbery Bob 2: Double Trouble. It is typically found tied to a lead and it will give chase if it spots Bob and is (unlike the normal Dog) capable of busting Bob. If Bob runs around objects, the Guard Dog's lead will become entangled around them and if Bob runs around enough objects, the Guard Dog will eventually "run out" of lead and get stuck, rendering it unable to get any closer to Bob. Like Security Guards, it can be removed from the level by using a Teleport Mine.