During the Christmas season several years ago, our neighbor’s house was entered one night and Christmas presents were taken. The tree was in the den, visible through glass patio doors. Apparently the burglar was able to reach in through a dog door, which was in the back kitchen door next to the den, and unlock the dead bolt. The neighbor said her two fairly large dogs came upstairs to her bedroom to hide while this was going on. She found out when she woke next morning.