I don’t have a Rosie, but I do have two Border Collies that will wear your ass out. Not the blood and guts of a Rosie mind you, but a unrelenting and constant attack. The best security they bring however has nothing to do with their viciousness, it has to do with their ears. There is a road half a mile from my cabin, if a car moves down that road both dogs will immediately come to alert. If there is anything in my environment that moves, farts or quacks these guys will let me know. I don’t need a dog to fight my fights I need them to tell me when and where I need to bring fire to bear.