Pet Gear Designer Pet Booster Seat Booster easily attaches to car seat; turns into a bed for home use Seat can be seat belted in vertical or horizontal position Tether can be attached to pet's harness to keep them comfortable and secure Machine washable cover Measures 18.5"L x 17.3"W x 7.5"H; interior dimensions 13.5"L X 9.5"W X 6"H Booster easily attaches to car seat; turns into a bed for home use Seat can be seat belted in vertical or horizontal position Tether can be attached to pet's harness to keep them comfortable and secure Machine washable cover Measures 18.5"L x 14"W x 7.5"H; interior dimensions 13.5"L X 9.5"W X 6"H