The Dog’s Life Stuffable Treat Hiders are made with natural rubber from the sap of rubber trees, so it's non-toxic and 100% biodegradable. They’re free of any harmful chemicals like BPA, phthalates, latex and vinyl and are super fun to play with! They’re durable and fun for moderate chewers and persistent chewers who like the springy resistance of this more flexible chew toy. They’re durable, fun and, and challenges the brain in fun and stimulating ways. Help your dog fight boredom and stay busy while you're away! The Stuffable Treat Hiders have openings at the bottom for inserting treats or dog food for use as a slow feeder. Fill with their favourite treats or food, and top it off with some peanut butter to create an engaging puzzle for your pooch. The safety air vent protects your pooch, keeps happy tongues from getting stuck. Made from our natural rubber which is durable enough for persistent chewers yet soft and chewy enough to satisfy your dog's chewing impulse. On top of it all, the Stuffable Treat Hider is great for water play since it can be thrown and bounces and floats in the water. Natural rubber is a renewable, sustainable resource. Help protect nature for you and your pup. Dishwasher safe!