This is our second car carrier. We had the first one for about nine years. Before that I bought a small and it was too small for my long bodied bichon so I ordered the double sized. Little did I know I would rescue a 7 lb malti poo and they ride in it together. My bichon gets carsick and she can look out. It saved their lives when we were rear ended on the interstate. We were at a dead stop. Traffic and weather were the reason. We were rear ended at about 70 miles an hour. They were secure in their seat. We won’t go to the corner without being buckled in. Thanks for saving their lives. We highly recommend this!!