We've watched our 75 lb Shep/Sharp on our web cam numerous times as we left to shop or eat out. She looks out the front window and watches us drives away, and then lies down and snoozes pretty much for the rest of the time we're gone. Occasionally, a noise of some sort will get her attention enough to look out again, but even other dogs walking by don't seem to upset her. The only time she's barked more than a quick "woof" or two, was when a small kid kept running over and pounding on the side of the coach until a neighbor had a park employee speak to the kid's mother.