Good for her to step up and say "no" and ignore him. It sounds like the usual bluster from this "personality", and to-be-expected threats in a last-ditch effort to bring her back in to compliance in his little mentally unbalanced world. I seriously doubt he'll do anything like filing paperwork on the "stolen" dog - it's just the last thing he has available to try holding over her head (i.e. it's probably just a threat, unless he's truly that obsessed and controlling). If he does file paperwork (assuming that's even possible), like you said, it's her dog too and he's proven himself abusive, so the animal would be in danger under his care, should anything ever get that far. Also, him taking that kind of action would only shine the spotlight on himself... which is not something these 'types' want. They work better in the shadows. That said, she might want to file restraining orders, etc., and be more pro-active about her safety (and the dog's) if this move isn't enough to keep her from his grasp because he's that crazy. I'm so glad she has the dog!!
Regardless of his past actions and current threats, she has escaped. Keep in the back of your mind that she likely has PTSD and other traumas to heal from with this experience with this guy, and please make sure she stays far, far away from him (and others like him) forever.
I'm sorry your weekend plans washed out - that's a lot of rain :3 We had some rain here too, but not enough to start refilling the retention ponds, which are quite low ATM. That'll change with more rain, as is usual for the rainy season. I'm just glad the ground could absorb what came down instead of running off and making a mess of things. My garden certainly looks happier after the rain :3
I did not hear about the tornado, but knew they were possible with that line of storms that came through. I hope it wasn't completely horrible for the people in its path.