MYJAQI Back Seat Extender for Dogs, Waterproof Dog Car Seat Cover for Back Seat with Hard Bottom, 2026 Upgraded Material, Anti Scratch, Safer, Easy to Use and Clean, Holds 400lbs

I use this seat protector and it works out great. The hard floor extends past the end of the seat and makes a nice space for my German Shepherd at ~75 pounds. https://www.amazon.com/dp/B0D9Y6X8K8?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1