At age 11 weeks, my longhair shaded red doxie rode 1000 miles in a pack on my chest. By the time she was 5 months, she was a terror in the car. She wanted to stand on my lap with her paws on the wheel looking out the windshield. The booster seat solved the problem! From the 1st time I attached her halter to the strap in her safe place, she loved it. Tried every position: curled in a ball, standing with paws on the front wall, looking out the side window at the car wash brushes, and lying on her ...