Please NEVER EVER LET YOUR PUP RIDE IN FRONT SEAT. My groomer did. She had an accident, airbags deployed hit pup. Broke jaw, and now to get dog into car she has to sedate.
We have a few methods with Waffles depending on what we are doing. All being in the REAR SEAT and attached to seatbelt
We crate her and seatbelt crate when traveling with camper.
We have a booster seat with harness and secured to seat belt.
We also use a carabeaner and harness to seat belt.
Hope that helps. All purchased at PETCO