Locks only keep out honest people. Likewise security systems: bought one, and the only break-ins were committed by my kids, while the old folks were away on vacation, for adolescent party purposes. I go with the dogs-they bark at everybody, including the kids. Geese and guinea hens are more effective, but substantially less winsome than the dogs. The fowl do cook up better than the dogs.I am working on a security device that will fire low velocity cold cuts at intruders: turn the dogs loose, and the intruders will be way too busy to do any serious intruding.