Wolves communicate within their packs through a variety of vocalizations, body language, and scent marking. They use howling, growling, barking, and whining to convey different messages such as signaling alarm, establishing territory, coordinating hunts, and maintaining social bonds. Additionally, wolves use body posture, facial expressions, and tail movements to express dominance, submission, aggression, or playfulness. They also use scent marking through urination and defecation to leave messages for other pack members. Overall, communication within a wolf pack is complex and essential for their social structure and cooperation.