I echo the others. I have a deer bone, but it only gets used once or twice a year - when there is a deeper scratch that normal brushing will not get out by itself. Works very well for that precise purpose.
Half N Half: once you learn the secret, it makes it hard to opt for AE shell instead of Carmina when they are the same price. I've never paid customs when shipped DHL, but always get hit by FedEx. Customs has been $25 on a $400 purchase the few times I've been hit in the last year.