Frozen marrow bone that I got from the butcher. I get one for molly and one for Buster. I give Buster his in his crate and Molly eats hers in the kitchen. This is NOT the first time they have been given one.I have been buying them through out the summer. Well I just went in to see how Buster was making out with his bone and he growled at me for getting to close now mind you the crate door is shut and locked and all I did was walk over to the crate and said " YUM good bone huh" ( yes I talk to them ) he then growled which caught me off guard. I yelled NO and opened up his door to take the bone but he picked it up and went farther back into his crate.I reached in to take it and again he picked up the bone but this time growled and came forward at me.I shut the door cause I figured he would bite me if I didn't get my hand out of his area.I wish i could get the bone and this will be the last time he gets a bone again because I will not have this behavior with kids in the house.He has never acted like this before and doesn't act like this with his dinner or breakfast , why now?