Using this dog toy is simple. Just give it to your dog, and they'll start chewing and sniffing right away. When it comes to maintenance, you can wash it occasionally with mild soap and water. As for the size, pick medium if your dog weighs between 15 - 35 lbs, and large if it's 35 lbs or more. Always keep an eye on the toy. Check it often for any signs of damage like rips or tears. If you find any, don't let your dog play with it anymore. Throw it away safely. Also, remove all the packaging before giving the toy to your dog. This way, you can ensure your dog has a safe and fun playtime.