The Booster steps have a solid wood base so it will hold a large 100-120 pound dog. These steps can be made to any specs but the standard issue steps we have are 18" wide, 8" high first step,16" high second step. Each step is 12" deep. Total size, 24" long x 16" high point. Carpeted steps. Comes in neutral color unless specified. NO assembly required. Weighs about 40 pounds.