The best thing I have found for my pits is the deer antler! You can buy them in bulk at feed stores, online (although they only sell individual and are expensive). One of the companies I buy from is the Montana Antler Co. and they are online and will sell in bulk. It takes weeks for them to chew them down, they don’t fight over them, they don’t smell, aren’t greasy and don’t splinter like bones. The best thing is that they are shed naturally by the deer. They come in all different shapes and sizes and there is no rhyme or reason for which ones my pits pick out! LOL! Best investment ever for those with extreme chewers!