My sister and I were playing with our Golden Retriever in the garden.  When we went out we went through our patio doors which are of course all made of glass.  We closed the doors behind us.  As we were chasing our Golden Retriever (Maysie) around the garden, she decided that she was going to run, well I should say sprint, indoors.  As she was doing so she jumped up to jump back into the house, not knowing that the doors were closed, and jumped right into them.  Luckily it was double glazed so it didn’t break.  She landed on the floor on all four feet, she was fine, shook her head and then ran inside another way.