Hey! I have a 7 month old GSD and we've recently introduced him to the new joy that is a marrow bone-- turns out, he likes it enough to snarl and growl when it's time to take it from him! We've never seen this kind of behavior in him before. How would we be able to curb it? I would really like to still offer him a piece of marrow bone occasionally without fearing I will get bitten.