Dog seat belt alarm

I take my dog with me to the park and around town once in a while.  It's really difficult (nearly impossible) to keep her in a seat with a seat belt on.  When I drive with her in the car, the seat belt warning keeps going off.  The car thinks there is someone in the passenger seat without the seat belt on.  I'd love to be able to press the seat belt warning on the screen and dismiss it for the remainder of that drive.  Yes, I know it's not safe driving around without her seat belt on, but we're typically not going far and she LOVES coming out with me.  If anyone has any recommendations on dog seat belts that work for a ~50 lb dog, I'd love to use one!

Did you already try the "fat-man's-cheat"? Fastening the seat belt BEFORE the dog enters.