Every now and then Byron (11 months old) gets possessive of a chew bone or something he's gotten hold of that he knows he's not supposed to have, and he'll flatten his ears and growl when approached. I've tried bribing him with a treat but he still remains agressive (sometimes snarling and snapping) about protecting his "prize". Otherwise he's a very gentle and non-agressive.

Any suggestions on how to handle this?