I started to trust Laddie alone in the house about 2 months ago, he was 6 months old I believe and house broken. I was so proud of him, I had been gone for about a half hour, and when I got back, he was asleep on the bed and nothing had been touched and no "mistakes" anywhere. I now leave him out all the time when I will be gone for short times. Longer periods, I take him with me. No, I take that back, LOL, one day, I was at this clients of Steve's having lunch with them, we were gone over 5 hours and I just knew that the poor thing had probably made a mess or destroyed things, but no, the sweet angel, was perfect, he happily met us at the door, and after I let him out to potty, I checked the house, nothing had been touched, and again, no "mistakes" he is a very good dog when alone.
At night, he automatically goes to his crate and sleeps there, he loves it, I am sure he would be OK if not in it, but since he loves it, I continue to use it as his "bed", he feels secure there.