The 123 Treats Rawhide Bones Chews 3-4″ (100 Count) Premium Rawhide Dog Bones are perfect for promoting healthy chewing habits in your dog. These bones are made of 100% natural rawhide, which is sourced from southern Brazil cows that are free range and have not been treated with hormones or chemicals. The cool climate of the region ensures that these bones will not be exposed to harmful levels of heat or light, which means you can give them to your dog without worrying about toxic substances being released into the air.