Apparently bears do not have the patience that your dog does at dinner time. They see the bag of bread they want the whole bag. :-)
Entirely too many people (idiots) think Disney movies are nature documentaries. Animals (including your pet dog) are NOT furry people and cannot be reasoned with nor can their behavior be fully predicted. That’s partially why I gag when I see some nitwit (like my neighbor) holding a conversation with her dog. “Now don’t you do (whatever).” The dog doesn’t understand words. They can understand pain/reward to be conditioned to do or not do things (sometimes), but you can’t convince them to do something by reasoning with them.