Using this dog collar is easy. First, measure your dog's neck and follow the sizing instructions to pick the right collar size. Put the collar around your dog's neck and fasten it through one of the holes. Make sure it's not too tight or too loose, and you should be able to fit two fingers between the collar and your dog's neck. As for maintenance, keep the collar clean by wiping it with a damp cloth regularly. Avoid getting it too wet as it's leather and prolonged exposure to moisture can damage it. If it gets dirty, use a mild leather cleaner. Also, check the buckle and dee regularly to make sure they're in good condition and working properly.