tasher,
Since no one is around when the pooping occurs, are you sure it is Sophie? One of the other dogs may be doing this in reaction to the stress of another dog. The dog who acts guilty is not always the one who did the deed. Also, is Sophie used to using a doggie door? If this is new to her, she may not think of it when she needs to poop. (I've a six-yr-old shepherd who, once she got the idea of the door, thinks it is better than sliced bread! Open the door with the doggie door and she will ignore the opened door and use the doggie-flap.)
I am leaving the more important problem, the snapping, to others to respond.
kjd
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