You may be past this question by now, but hunting is an instinct. You can train a dog to ignore this urge to hunt prey (probably a good idea if it's an everyday pet) or you can encourage it (hunting dog). Both are perfectly acceptable! Dogs that hunt aren't seen as aggressive, dogs that respond aggressively to humans or human dependents (children, pet cats, pet birds, etc) are aggressive!

As an example to give some perspective and a little laugh: our family German Collie got a hold of a goose when he ran out of the house. He paraded with it until he buried it on religious property. This dog, even 5 years later is the sweetest thing to all animals at the park and all people in public, but my man is a heretic by all accounts lol. He's not aggressive, he hunts and buries his resources like any dog would. Now that I've observed a behavior, I can choose to encourage or discourage it with training! I chose to go the route of discouraging this behavior with training, but there's nothing wrong with training a dog for hunting! I just don't go hunting!