FIVE ADJUSTABLE HEIGHTS: This 44.48 inch adjustable dog ramp is perfect for small to medium sized dogs, adjusted in 5 heights of 14.96in - 17.71in - 19.68in - 21.25in - 22.04 in, suitable for furniture of all heights. ANTI-SLIP AND ANTI-TIP DESIGN: The pet stair use non-slip mats and wooden grooves to increase friction for non-slip dog paws and walking surfaces. Our dog ramp adds 7 support crossbars and 2 removable guardrails to prevent your pet from falling while climbing. HIGH QUALITY AND LOAD BEARING: The dog step is made of 1-inch thick pine wood. Sturdy and stable solid wood construction and extra-long dowels provide strong support that won't rock or sway. Sturdy ramp is independently safety tested to hold up to 200 lbs.