These dog car seats are suitable for one or two dogs weighing up to 30 lbs or 14kgs, so they are ideal to be used as a double dog car seat, should you have 2 small dogs. Our dog car seats have been very successful in alleviating dog car sickness and anxiety. Our dog car booster seats are a large size or xlarge compared to many on the market, measuring 19" (48cm) long x 14" (36cm) wide x 10" (26cm) high when assembled. When collapsed they measure 21"(54cm) long x 14" (46cm) wide x 3" (7cm) high. Our large dog car seats are made with a strong waterproof exterior fabric and have a soft, padded fleecy liner, which can easily be removed for washing. Inside the dog car seat, they have a reversible tough thin mat, which is waterproof on one side for when your dog is wet, or dirty. Also included, is a thicker grey colored fleecy dog cushion, to add more comfort and luxury for your dog. There is three large pockets in the car dog seat, two with zippers and one open pocket. Also on one side is a drink bottle holder. Our large dog booster seats have strong metal clips, big buckles and wide long straps, making it suitable for any vehicle with adjustable headrests. The dog car seat can be easily collapsed for storage, when not in use. When assembled can be adjusted to suit your dogs viewing ability outside the car window and quickly elevated off the seat, for storage underneath. We know your dog will love our dog car seats for the luxury and comfort it offers one dog, or the convenience and space it saves having two in there, making it a perfect double or two dog car seat, so purchase one today. Our 5000+ customers have loved them!.