Using this Playology Squeaky Chew Stick is easy. Just give it to your dog and watch them have a great time chewing and sniffing. The all - natural scents will keep them interested. When it comes to sizing, pick the medium if your dog weighs between 15 and 35 lbs, and the large if your dog is 35 lbs or heavier. Remember, no toy is indestructible. Check the toy often for any rips or tears. If you find any damage, take the toy away from your dog right away and throw it out. Also, always remove the packaging before giving the toy to your dog. This will ensure your dog's safety while they enjoy their new toy.