Dogs and puppies are pack animals who are instinctively drawn to their mother and others in their pack. The Snuggle Puppy recreates that intimacy with physical warmth and a simulated heartbeat. The result is a calmer, more peaceful pet -one that feels less loneliness, fear and separation anxiety. The Snuggle Puppy uses a real-feel pulsing "heartbeat", the AAA batteries (included) last up to 2 weeks with continuous 24/7 use. Included with your Snuggle Puppy is one disposable warmer pack (Safe for people and pets that lasts 24 hours) for an extra source of comfort for your pet. The Snuggle Puppy is all natural, medication free, and calms your pet by appealing to basic natural instincts.