One of our customers in Berowra came home new years day to find her dogs locked in her garage with no water on a hot day. Thankfully they were ok! Puzzled about how they got in she left them again inside the house the next day when she went out, only to find them out with the front door open on her return. To her amazement one of the two dogs had jumped up and opened the door. This is how they had got locked in the garage, they had jumped up and opened the internal garage door and then gone into the garage and the door had shut behind them.
By changing the door handles for her and making some other modifications, those doggies wont be able to open all the doors and will be safe.