Using the M - Pets Secura Harness is easy. First, when using it in the car, simply attach the harness to your vehicle's seat - belt system. Make sure it fits your dog properly by adjusting the straps according to the size guide. When you're going for a walk, you can quickly convert it from a travel harness to a walking harness. Just unclip and re - arrange as needed. As for maintenance, it's recommended to clean the harness regularly with mild soap and water. Let it air dry. Always check the straps and clips for any signs of wear and tear before each use. If you notice any damage, replace the harness right away. Also, ensure the harness is the right size for your dog to avoid any discomfort or safety issues.