HeroAntlerChews™ are a 100% Canadian naturally shed antler from government inspected farms. Our antlers are a great long lasting chew, and an excellent source of glucosamine, chondroitin, calcium & protein. HeroAntlerChews™ are free of preservatives and chemicals, and will not splinter or stain. HeroAntlerChews™ are excellent for dog with allergies and sensitive stomachs. As with all pet treats pet supervision is recommended.