Vented Vest Dog Harness. Not just a harness, this innovative product is a car restraint, a chest protector and a non-choking harness that easily connects to either a leash or a seat belt for added security. Pull on adjustable neck and dual clips around body allow for easy on/off. Machine wash cold on delicate cycle, air dry. Sizes:XXS:: Chest: 12.5-18 in. | Neck: 7-12 in. | For pets 5-10 lbs.XS: Chest: 15-21 in. | Neck: 8-15 in. | For pets 10-15 lbs. S: Chest: 18-24 in. | Neck: 11-20 in. | For pets 15-25 lbs. M: Chest: 22-29 in. | Neck: 13-25 in. | For pets 25-45 lbs. L: Chest: 24-32 in. | Neck: 16-29 in. | For pets 45-70 lbs. XL: Chest: 28-37 in. | Neck: 20-34 in. | For pets 70-110 lbs. *We suggest rounding up to the next size if your measurement is near or over the maximum range, or if your pup has a broad chest or thick coat.