In the 'women pinned by family dog' story, there could be several scenarios. For instance, if the dog was a large breed and not used to being around people all the time, it might have misjudged its strength when approaching the woman. Or perhaps the woman was in a position that made the dog curious, like if she was lying on the ground for some reason. And the dog, being a creature of instinct, went over to investigate and in the process pinned her. It could also be related to the dog's territorial behavior. If the woman entered an area that the dog considered its own, it might have reacted by trying to keep her there, resulting in her being pinned.
Well, it could be that the dog was in a state of panic due to some external stimuli like a loud noise. And in its confusion, it ended up pinning the woman. Another possibility is that the dog was not properly trained and didn't understand its boundaries, so it jumped on the woman and pinned her without realizing it was inappropriate.
Maybe the dog got overly excited and accidentally pinned the woman while playing. It could also be that the dog was trying to protect something and saw the woman as a threat in that moment.