All natural, stuffed, beef shin bone. Filled with a specially formulated filling of beef and peanut butter. This great-tasting chew can be enjoyed by your dog even after the filling is gone by re-filling it with your dog’s favorite treat, making it a great natural alternative to plastic stuffable toys. Unique shape and texture helps “brush off” built-up plaque and tartar, promoting dental health and helping prevent bad doggy breath. Barkworthies are preservative-free, hormone-free, and antibiotic-free.