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Pretty much every dog has sharper ears than you. If you want the dog to hunt with then the best one depends on what type of hunting dog you want. There are a bunch of different types sighthound, scenthound, retrievers, points, etc. Then you have to train them from birth to do what you want, and even then they might still suck at hunting.
I don't think a dog will be much help keeping you safe from bears or wolves though.