I love the size of this so I can fit both my dogs together. One is 12 pounds and the other is about 20 pounds. They both fit great with no problem and still has extra room to move around if they wanted. They could both sleep comfortably in it too. They seemed very comfortable and happy while riding in the car in it. After reading other reviewers I decided to not chance the hooks that come with it to hook into the dogs harness and instead bought the one that hooks around the headrest. It was pretty easy to instal in my suv and looks great. It still moves a tiny bit but barely. I secured it pretty tight. So I feel so much better knowing that if I had to break hard suddenly my babies wouldn’t go flying or fall onto the cars floor. My dogs safety is my priority and I feel a lot better knowing they are safe and secure.I searched long and hard at all kinds of different booster/car seats and after all the researching I decided this one seemed to be the best. I know it’s pricier than others but totally worth it. I am very satisfied with this product and an happy to have found it.Also all the reviews as well as pictures showed that it has straps on the back to pull seat belts through. But Mine had the straps in the front along with a buckle in front to connect the seatbelts. So the seat belt goes across the front which makes it extremely secure so I won’t move forward. It really stays in place. At first I thought I got sent a defective one since straps were in the front but then realized after reading the instructions that was provided also with pictures I saw that it was not at all defective. Maybe they used to make it with straps in the back but updated to straps in front.