It kinda hangs off the back of the counsel so it can be level. I got Ahi the littlest one and she has room to grow about 2 more pounds. I drive an Armada and it fits well because of the back being off the counsel a bit. I have it strapped down tight and it doesn't budge. I love my Snoozer. Here is a pic of her on the way to drop off her sissy's to school.