Four steps at 5, 10.5, 15.5, and 20 inches give a pet a graded climb rather than one high jump, and each tread is cut wide with a gentle slope so paws land squarely instead of scrabbling at a narrow edge. That progression is what suits pets who suffer from arthritis, joint stiffness, or other mobility impairments, and it is why the stairs reach a windowsill, a bed, a desk, a sofa, or a couch without a leap at either end.Stability comes from the shape. The steps form a triangular structure over a large base, stable enough not to wobble when a dog puts its full weight on the top tread, and they carry up to 132 pounds. Underneath, silicone paw prints grip the floor while the non-slip suede surface holds a paw on the way up.The fill is high-density deformation-resistant foam, thick, soft, and high-rebound, so a step keeps its shape over months rather than flattening into a slope. Every edge is rounded off with no corners to catch a shin or a paw during an accidental collision.The suede cover unzips and goes in the wash, which matters on something a dog uses several times a day. One practical note on delivery: the stairs arrive in vacuum compression packing, which keeps the sponge in good condition during transportation, so allow them to expand fully after unpacking. Finished in gray at 28.5 by 16 by 20 inches and 6.5 pounds.