Jax, who is 6 months old, got his first raw marrow bone today. He LOVVVVED chewing on that thing!! My only concern is, and maybe it shouldn't be a concern, but when my husband went to take it from him, he growled. He didnt snap, nor did he raise his lip to show gums. Is this normal behavior for what I thought was the MUSHIEST...MOST LOVABLE dog on the planet? I never though I would hear my baby growl...it made me sort of sad.