Elevating your dog(s) while riding in cars can greatly reduce their anxiety and improve behavior. Securing pups in place with a proper car restraint will increase your level of safe driving without distractions. Plus restraining dog(s) will prevent them from flying around the vehicle in a sudden stop or accident.
Here are some high-end booster seats, one from K&H Manufacturing, called "Bucket Booster," and one micro velvet model "Booster Seat" from Bowser Pet Products. Please measure your vehicle and your dog for a better idea of how each will fit together and in your car.