What Size Dog Bed Do I Need?

Measure your dog lying fully stretched out — nose to tail, paw to paw — and add roughly 6 to 8 inches to each dimension. A bed sized to the dog exactly leaves no room to sprawl, and most dogs sprawl at least part of the night.

How to measure your dog

Do this while your dog is asleep or resting, since a standing measurement won't capture the sprawled sleeping position.

1. Length: nose to base of tail while lying fully stretched out on their side, not curled.
2. Width: paw to paw at the widest point of the stretched-out position.
3. Add 6–8 inches to both numbers. This is the margin that keeps a leg or the head from hanging off the edge.

If your dog sleeps curled in a tight ball every time, you can size closer to the minimum. If they sprawl flat on a side — most dogs do at least part of the night — size toward the larger end.

Bed size chart

Weight is a rough starting point, not the deciding factor — a low, long dog like a Basset Hound needs a longer bed than the weight chart suggests, and a compact, dense breed like a Bulldog can need less length than its weight implies.

When to size up regardless of the chart

• Sprawlers. Some dogs never curl up. If yours is one of them, buy for the stretched-out length, not the weight bracket.
• Senior dogs and dogs with joint issues. More surface area means more room to shift position without falling half off the bed, which matters once getting comfortable takes more effort.
• Multi-dog households sharing a bed. Size for both dogs stretched out side by side, not for one dog with the second squeezed in.
• Deep, thick orthopedic foam. A thicker mattress can shrink the effective sleeping surface compared to the bed's outer dimensions — check the usable sleep area in the listing, not just the exterior size.

When a snugger bed is actually the better fit

Not every dog wants maximum space. Anxious or nervous dogs often settle faster in a bed with raised bolster sides that create a den-like, enclosed feel — in that style, right at their measured size (rather than several inches oversized) is usually more comforting than a wide-open surface. A calming donut-style bed is the common pick for this temperament, sized to the dog's curled-up measurement instead of the stretched-out one.

Orthopedic vs. standard: sizing is not identical

Orthopedic memory foam beds are usually listed with the same size names (medium, large, XL) as standard beds, but the exterior dimensions often run larger for the same usable sleeping surface, since the foam itself adds thickness on every side. When comparing a standard and an orthopedic bed at the "same" size, check the listed interior or usable sleep dimensions rather than assuming the exterior numbers mean the same thing. Our orthopedic dog bed guide covers what the foam itself is doing, separate from sizing.

Crate-adjacent beds follow the crate's size, not the dog's

If the bed is going inside a crate, size it to the crate's interior floor dimensions rather than to your dog directly — a bed sized correctly for the dog can still be too large for the crate it needs to fit inside. Measure the crate's usable floor space (not the exterior model size) before buying a crate mat or pad, and check our crate sizing guide if you're sorting out both at once, since an oversized bed inside a correctly sized crate defeats the point of either.

Multiple beds, multiple rooms

Many households keep a bed in more than one spot — a main bed in the living room, a smaller one upstairs, one in the car. These don't all need to be the same size. A dog that fully stretches out to sleep for the night can get by with something snugger for a daytime nap spot or a car ride, where the goal is a comfortable resting place for shorter stretches rather than a full night's sleep. Buy the generously sized bed for wherever your dog actually sleeps longest, and save the budget on secondary spots.

Getting it wrong is a comfort problem, not a safety one

Unlike crate sizing, where too big undermines house training, a dog bed that's oversized has no real downside beyond floor space and cost. Too small is the actual mistake — a dog who can't lie fully flat is losing sleep quality, and over months that shows up as more restlessness, more shifting through the night, and, for dogs with joint issues, more pressure on the joints that aren't supported.

What to do next

Measure your dog stretched out before you shop, add the margin, and check the bed's usable sleep dimensions against that number rather than the weight-based size label alone. Full comparisons with prices are in our best dog beds guide.