MushroomCat Pet Dog Products Arctic Freeze Chew Toy Cooling Teether Dog Toy 2 Pack Durable, filled with 100% purified water. Designed to be frozen, to keep your dog cool, as well as freezable for long lasting refreshment. Perfect for teething puppies, meanwhile, helps clean your dog's teeth and massage its gums that prevents plaque and tartar buildup. Put in the snacks that the dog likes, which can improve its interests and hold your dog's favorite treats Great for indoors or outdoors.