This harness incorporates the heartbeat technology adjacent to the Dogs chest. Useful for Dogs that have trouble walking calmly. The harness is also perfect for use in the car to prevent driver distraction. Walking Harness Comfortable and securebrAnxiety Aid Houses pulsing heart against pet breastbrAppeals to natural instincts that produce calm when another heartbeat is nearbrAutomobile harness Effective seatbelt receptorbrHandy pouch Convenient for treats and waste bags so you don't have to carry thembrReduces aggressive walking tendencies Calming characteristics improve behaviours Small: Dogs with chests 38-53cm/15-21