Our Mosaic® USA-Sourced Ostrich Knuckle Bones are a perfect alternative long lasting chew for dogs that suffer from food allergies to common proteins, such as chicken, beef, pork, and lamb. Our hypoallergenic ostrich knuckles have meat cooked to the bones, which is a great added bonus to keep our furry friends happy and occupied. The chews are highly digestible. Source: Responsibly made & sustainably-sourced in USA. Limited-Supply. Size: Small. For small/medium dogs & aggressive chewers.