Several, actually a bunch of years ago a friend lived in an area where there were a lot of daytime house burglaries. They would break a window in the garage door and reach in and unlock the garage door to gain entry. She came home one day and saw the broken window in the garage door and her heart just sank. She opened the door with the opener and her GS was sitting there waiting to be petted. With that look that said look what I did. The inside of the garage door was covered in blood and lots on the floor. For some reason it appeared the burglar never gained entry. She said the dog got lots of attention and ate steak that night.