A dog riding loose on a back seat is a problem on two counts, and this booster addresses both. The 5 inch thick cushion raises the dog high enough to see out of the window, which elevates the pet's view and reduces anxiety on a long drive, while an adjustable strap plus two safety leashes hold the animal in place rather than leaving it free to move around the cabin. It carries dogs and cats up to 55 pounds.Under the plush there is real structure. The core is orthopedic egg crate foam, firm rather than squashy, so it gives firm and comfortable support without collapsing flat under a settled dog on a two-hour trip. The cushion itself measures 17.5 by 16.5 by 5 inches inside an overall 32 by 21 by 18 inch seat.The base is where a booster usually fails. A non-slip bottom keeps this one in place through turns and sudden braking instead of sliding across the upholstery, and the whole unit installs easily with all the necessary kits supplied. It fits a sedan, an SUV, a van, or a pickup.Details round it out. The face is ultra soft short plush, the cushion cover is washable when it picks up hair and mud, and two large capacity side pockets take a lead, treats, or waste bags without anything loose on the seat. At 5 pounds in brown and black, it lifts out and serves as an indoor pet bed once the journey is over.