I certainly learned some time ago that Chike, is as most b's exceptionally smart. Now he has outsmarted me and I have no idea what might work.
I take the dogs with me in the car farily often and use dog seatbelts. About two months ago Chike pops up to the front seat with me. I thought the harness had broken or accidently come undone.
After a couple more trips with chike bounding out of his seat and being unable to find anything wrong with the harness I started paying closer attention.
Shortly after I had buckled him in I watched him as he took the seat belt latch between his two front paws and poked the button with his nose until it came unlatched.