Look, there's no villain here. The dog trying to get to our hamster friend, Henry the Border Terrier, is merely acting on his natural bred behaviour to hunt rodents, but our hero is definitely Nina the bigger dog here who protects Dusty (that's our hamster) from getting stomped or eaten.
Good for pet management, not so good for keeping other vermin out of your gaff. But then that's what cats are for.
Via YouTube