Best Dog Harness for Cars (2019): Crash-Tested Seat Belts A strong car harness can protect your dog in the unfortunate event of a collision, while also making sure he's secure and can't cause distractions. It's vital to get a product that's crash tested and adjustable though, otherwise it may not provide much protection. My top pick for a dog car harness is the Sleepypod Clickit. It's a strong model 3 Best Dog Harnesses for Car Travel in 2019: Crash-Tested Jan 14, 2018So, be sure to strap your dog in with a good harness, and have her ride in the backseat to keep you both as safe as possible. Best Dog Harnesses for Car Travel. If you drive with your dog frequently, you’ll want to select a good car harness, which has been crash-test certified and provides all of the things you’d want in a harness.