Ayo did that once when he was a puppy , with rawhide, and he did it one more time with a marrow bone. Here is what I did, it worked for me. I decided instantly that that was unacceptable and proceeded to remove it regardless of his growling, and then return it when he calmed down. Over and over, and then I would wait a while and do it again. I would do that all the time, every time he had something or I gave him something, every time I walk by him and he has something I take it away and then give it back, , teaching him leave it , in the process but if it wassomthing really tasty he wouldn t leave it I would take it away and then give it back. make him work for everything you give him, and make sure you are the first one in and out the door. Also. When you feed him, touch him, pet him while he is eating, and have the rest of your family do that also. .
I am no expert, but this worked for me, he has never done at again, not even with the real bones or the raw meat , not even with other dogs!!!. i still do it whenever I remember, I give him something, then take it away.
Its important to deal with that right away, when he is a young puppy…