We have an automatic pet feeder with webcam, speaker and microphone. We don’t leave our dog with it alone when we go away as he goes to his sitters house or comes with us. It’s convenient while we are around. Every now and then when I’m at work and he is at home alone I would jump on and say hello. He just howls and howls when he hears us calling. It’s the same even if someone else is home with him, as soon as he hears anyone from the family talk to him through it he starts to howl.