The Sherpa to Go Dog Car Harness keeps your dog safe and secure in the car. The sherpa-lined harness fits easily on your dog and then simply feed the seatbelt through the extended strap or use a car control strap (sold separately) to secure to seatbelt. Harness has small brown/black pinpoint check pattern. Durable metal hardware and d-ring. Matching Sherpa to Go items sold separately. Sizing Information: Small: 12-18" chest girth, dogs weighing up to 12 lbs. Medium: 16-24" chest girth, dogs weighing approx 12-20 lbs. Large: 22-32" chest girth, dogs weighing approx 20-30 lbs.