Ed is rarely left alone around the house. We crate the dogs when we're not there, and usually make sure Edison is within eyesight while we are.
When we first brought Edison home he had constant supervision - either in the crate or on a leash around the house. But as time has passed, he's gotten more and more freedom. First we ditched the leash, and now don't worry about having him in eyesight constantly.
Even still, anytime he is out of eyesight and being too quite, I get suspicious. When I go looking for him, he'll be laying on one of the rugs or pillows relaxing.
But there are still times I don't go looking for him - figuring he's lounging on the couch - only to hear the distinctive crash of something being pulled off of the kitchen counter.
Do your dogs get left alone in the house? How do they do?