How to Measure for Dog Stairs for Large Dogs | Get the Height Right

Buying dog stairs for a large dog usually goes wrong in one place: the height measurement. Most people measure the bed frame and end up with stairs that stop short of the actual surface their dog needs to reach. The fix is simple once you know what to measure, what numbers matter for a big dog, and why steepness matters as much as total height does.

What Exactly Should You Measure?

Measure straight up from the floor to the top of the surface your dog will climb onto. For a bed, that means the top of the mattress—including any topper or pillow-top layer—not the frame, box spring, or mattress base.

For a couch, measure to the top of the seat cushion. For a vehicle or perch, measure to the top of that surface. Write that number down; it’s the target height your stairs need to reach.

One common miss: people measure the bed frame because it’s easier to reach. The mattress top is usually several inches higher, and those inches are exactly what leaves your dog scrambling at the top step.

You also want the top landing to sit flush with—or within 1 to 2 inches of—the mattress height. A gap that’s too tall turns the final step into a jump, which defeats the purpose of the stairs.

And leave room at the base. Clear floor space in front of the stairs matters; most dogs need roughly 36 to 48 inches to approach and start climbing without crowding the furniture.

What Step Height Works for a Large Dog?

For large dogs, look for a step rise between 6 and 8 inches. Many product guides land on about 7 inches per step as a comfortable middle ground for medium and large breeds. A steeper rise than that starts to strain the joints and makes the climb feel precarious.

Some large-dog-specific guides are a bit more generous, accepting up to 8 inches. Either way, the principle holds: you want several low, manageable steps, not a few tall ones.

Furniture height determines the step count. A bed around 24 inches high needs stairs that reach roughly 24 inches, which usually means three steps at about 8 inches each. Taller beds in the 26- to 30-inch range typically call for four steps to keep each rise comfortable.

Why Width, Depth, and Stability Matter More Than Height

Height is only one part of the equation. A large dog needs stairs that are wide enough for their body, deep enough for their paws, and sturdy enough for their weight. Too-narrow steps reduce confidence and raise the risk of a fall—a real problem for a heavy dog coming down.

Aim for these dimensions:

Large dogs need wider, deeper, more stable stairs—not just taller ones. That shows the range, but bigger dogs do better at the wider end of it.

Weight capacity deserves a hard check before you buy. The American Kennel Club advises matching stairs to your dog’s size, the furniture’s height, and the product’s weight limit. For dogs around 100 pounds or more, hardwood or similarly sturdy construction beats lightweight plastic every time.

If your dog is senior, arthritic, or has mobility issues, consider lower rises or a ramp instead. Extra-deep steps and gentler angles reduce joint stress, which matters more than matching an exact height.

Common Measuring Mistakes to Avoid

The biggest errors are predictable and easy to fix:

• Measuring the frame, not the mattress top. Always include the topper or pillow-top layer.
• Buying stairs too short. The set must reach the actual surface height, not an estimate.
• Ignoring rise and tread depth. Total height is pointless if each step is too steep or too shallow.
• Choosing narrow steps. A large dog needs room to place all four paws confidently.
• Forgetting base clearance. Cramped furniture leaves no room to start the climb safely.

Avoiding a steep slope matters even when the height matches. If the stairs look like a ladder, the rise is too tall—find a set with more steps that covers the same height.

Once you have your floor-to-surface measurement and your preferred rise per step, you can divide the total height by the rise to find the step count. That math, plus the width and depth numbers above, gives you a clear shopping spec. When you’re ready to compare specific models, our roundup of top-rated dog stairs for large dogs breaks down the best options side by side. For more guidance on the general principles, the AKC’s advice on dog stairs and ramps covers sizing and safety considerations in useful detail.