I have five german wire haired pointers and a lab.. two of the six are indoor dogs and the other four are outside.. I can recall three times in almost ten years that someone made it to my door bell before they let out their howling and barking. I blame that on me forgetting to turn down my radio after welding in the shop and having the radio blasting away.. Three of the six will attack if i give a command. They are easy to shut up with one word or a hand signal if they are looking at me. It's all in training..