Using this dog harness is super easy. First, adjust the straps to fit your dog's size. Make sure it's snug but not too tight. Then, put the harness over your dog's head and secure it around the chest. Attach the leash to the metal loop on the back of the harness. When walking your dog, the harness will evenly distribute the pressure, making it comfortable for your pet. As for maintenance, you can hand - wash the harness in cold water with a mild detergent. Let it air dry. Avoid using bleach or machine - drying as it may damage the mesh material. Also, regularly check the straps and buckles for any signs of wear and tear. If you notice any damage, replace the harness to keep your dog safe.