My dog growled!
People are often shocked when their dog growls at them for the first time and it's usually over a bone, food dish or toy. This is seen as a form of betrayal! "You can't growl, I gave you that!"
But it's actually a natural thing for a dog to want to protect the things he has.
Often, though, it gets very out of hand and some dogs become too protective and it becomes dangerous. Sometimes well intentioned owners even make it worse accidentally.
If you're scared every time your dog gets hold of something or you give him his food and he growls or snaps, don't let it fester, get help!