Hey OP, I'm sorry this had happened to you. Her calling the police on such a dumb reason isn't the best thing to do. I know this community is revenge driven but I want you to know that I've once had frequent "bad mood days" too and turned out to be a complete asshole on random people for no reason.

Someday I realized I was rotten inside, dead, with a hole instead of a heart, filled with grieve and anger. I started looking for self improvement. It was not easy neither quick but through dedication anyone can be better. I have one phrase I always think about now is: "Everyone is fighting a battle you know nothing of, be kind, always.".

That and, if that Karen ever complains on you again, destroy her, but spare the doggo.