Guardian Gear™ Car Harnesses Keep Dogs Safe and Secure Help protect your pets while traveling in cars with our Guardian Gear™ Car Harnesses. Adjustable web harness attaches easily to virtually any seat belt with a universal seat belt clip. Keeps dogs safely contained with an adjustable strap that allows them to sit, lie down or stand comfortably. Made of strong, durable woven black nylon with plastic quick-release buckles and heavy-duty hardware. Note: Harness does not work with Ford Explorer seat belts. The Guardian Gear Car Harness is available in the sizes listed below. For proper fit, measure girth around the broadest part of the chest. X-Small fits 7"-16" girths Small fits 12"-28" girths Medium fits 20"-31" girths Large fits 28"-36" girths X-Large fits 32"-44" girths