Using this dog harness is easy. First, measure your dog around the body behind the front legs to find the right size. Then, put the harness over your dog's head and adjust the four slides to make it fit comfortably. Make sure it's not too tight or too loose. When using it, always keep an eye on your dog to ensure the harness doesn't cause any discomfort. For maintenance, simply wipe it with a damp cloth to keep it clean. Avoid using harsh chemicals as they may damage the neoprene lining or the reflective stripe. Store it in a dry place when not in use.