And then there was the time I had a dog that would not use the heavy dog door, so I'd have to lift if up for her to exit/enter. All was well and good until the day she stopped with about 6 inches of her tail still in the door when I let the door go.
After the initial howling, she became quite happy again. Its amazing how artisitic a dog can be when blood flys out of the chopped off end of its happily wagging tail.