I have a black lab that thinks the back seat of my truck is his trampoline and he can freely bounce from window to window or back seat to passenger seat as he pleases. Had a couple short stops that sent him to the floorboard over the years and I'm lucky he hasn't been hurt. Now, he stays put, all hundreds pounds of him, in one seat. I don't have to worry about something catching his eye outside and him trying to jump out. I also don't have to worry about the surprise pounce in my lap while driving on the freeway. If you have a vehicle sidekick like I do, you need to pick up this seatbelt leash. It's awesome.