NO MORE PULLING This headcollar can effectively control over dog's every movement and change unwanted behaviors like pulling, barking and jumping without making pain for dogs. By using our Pawaboo head halter, you will feel more free and safer during walking your dog. ( Tips: DO NOT leave it alone with dogs when not in use as they may chew through it.) . ALLOWS STRESS-FREE OF MOVEMENT No choking no coughing. It is designed to let your dogs pant, eat, drink and play anytime while under owner's control with headcollar. Reflective straps can ensure your dogs safety all the time even at night walking or training. . ADJUSTABLE & EASY TO USE There are detailed steps mentioned in the figure 3 to teach you how to wear our muzzle. This headcollar is comfortable to wear made of soft and durable nylon. A quick release buckle and adjustable clip allow you easily adjust your dog's neck and snout. ( Tips: For the most suitable width, please reserve space for one finger both on the neck strap and nose strap. ) . TWO SIZES AVAILABLE S SIZE recommended for dogs with 30-50LB/ 14-23KG; M SIZE for dogs with 50-88LB/ 23-40KG. We highly recommend measuring your dogs' snout and neck circumference and check the size chart(fig.2) carefully before you purchase. (Tips: When between sizes always choose the smaller one; NOT fit for short snout dogs.)