Dog Bed Size Chart for Large and Giant Breeds

By INVIROX Training Team · Published 2026-10-21 · 11 min read

What size bed should a dog have?

The most reliable method is also the simplest. CertiPUR-US, the nonprofit foam certification program, advises measuring your dog from the nose to the base of the tail while it is in its sleeping position, then adding 8 to 10 inches, or rounding up to the next bed size. The added inches give the dog room to turn, shift and settle without hanging over the edge.

The key words are in its sleeping position. A dog standing up is a different shape from a dog asleep. Some dogs sleep tightly curled and take up very little length. Others sleep flat on their side with their legs out and take up far more than their standing length suggests.

1. Wait until your dog is asleep or deeply relaxed in its usual spot, in the position it takes most often.
2. Use a soft tape measure and measure from the tip of the nose to the base of the tail, following the dog's shape. Do not include the tail.
3. If your dog takes more than one position, measure the longest one you see regularly.
4. Add 8 to 10 inches. This is the minimum length of the flat sleeping surface.
5. Measure width the same way, across the dog in its sleeping position, and add a few inches.
6. If a puppy is still growing, size the bed for its expected adult length, not today's.
7. Compare your numbers with the inner sleep area of the bed, not the outer size.

Take the measurement twice on different days. Dogs often sleep differently in a warm room than in a cool one, and you want the bed to suit the position your dog takes most of the year.

Dog bed size chart by measured length

This chart applies the CertiPUR-US rule to the lengths most large and giant breeds measure. Find your dog's measured sleeping length in the first column. The second column is the minimum length of flat sleeping surface to look for.

Width matters less for most dogs, because few sleep wider than they are long. Back sleepers and dogs that sprawl with their legs out sideways are the exception. Measure them across the widest point and add a few inches.

How sleeping style changes the size you need

Two dogs of the same weight can need very different beds because of how they sleep. Before you measure, spend a few evenings noticing which of these your dog does most.

Many large dogs mix styles: curled at the start of the night, stretched out later. If your dog does both, size for the stretched position if you want everything inside the bed, or choose a bolster bed if your dog is happy to rest its head and front legs on the raised edge when it stretches.

→ Related reading: why dogs like an edge to lean on

Size by weight: a rough starting point only

Many charts size beds by weight alone. Weight is useful for narrowing the search, but it is a poor predictor of length. A long-backed German Shepherd and a stockier dog of the same weight can measure several inches apart, and length is what decides whether a dog fits. Use this table to know where to start looking, then measure.

Treat the label column as a rough map, not a rule. One maker's XL can be another maker's Large. The measurement is what tells you whether a particular bed will work.

How big is an XL dog bed?

There is no standard size for an XL dog bed, or for any dog bed size label. Each maker sets its own dimensions, so an XL from one brand can be several inches longer or shorter than an XL from another. That is also the honest answer to what is the standard size of a dog bed: there isn't one.

The second trap is outer size versus inner size. A flat mattress bed's listed size is close to its usable surface. A bolster bed's listed size includes the raised sides, so the flat area the dog lies on is smaller, often by a foot or more in each direction. Always look for the inner sleep area on a bolster bed. If a listing does not give it, ask.

As an example, the INVIROX Luxury XL Dog Bed lists an outer size of 45 x 35 x 7.7 inches and an inner sleep area of 33 x 23 inches. The inner figure is the one to compare with your measurement, and the bolster adds headrest and leaning space around it.

Breed guide: why large and giant breeds deserve a supportive bed

Size is only half of the decision for big dogs. The other half is support, because heavy dogs press harder on their elbows and hips and spend many hours a day lying down. VCA Animal Hospitals notes that large and giant breeds are at higher risk of hygromas, fluid-filled swellings over bony points, when they lie on hard floors such as hardwood, tile or concrete, and that egg-shell foam or memory foam beds may provide the best padding.

Breed health records add context. The Orthopedic Foundation for Animals keeps a database of hip and elbow X-rays submitted by owners and breeders. The figures below are the share of dogs evaluated by OFA whose hips were rated dysplastic, and whose elbows were rated abnormal. Because owners choose which X-rays to submit, these numbers describe the OFA database, not every dog of the breed.

To be clear about what these numbers do and do not mean: a bed does not change a dog's hips or elbows. OFA notes that the severity of hip dysplasia can be affected by environmental factors such as caloric intake and level of exercise, and it does not list bedding among them. The figures are here to explain why owners of big breeds tend to care about cushioning. A supportive bed gives these dogs a comfortable place to spend their many hours of rest.

→ Related reading: what orthopedic and memory foam labels actually mean

Bolster beds and fit: what the headrest changes

A bolster bed works differently from a flat mattress. The inner area is where the body lies, and the raised sides are part of how the dog uses the bed: as a pillow, a backrest or something to lean against. That changes how you should read the measurement.

Here is the honest arithmetic for the INVIROX Luxury XL Dog Bed. Its inner sleep area is 33 x 23 inches. Using the CertiPUR-US rule in reverse, a 33 inch inner length suits a dog that measures about 23 to 25 inches from nose to base of tail in its sleeping position. That is the length of a large dog curled up, or lying on its belly with its head up on the bolster.

• Good fit: large dogs that curl up, lean against the sides, or sleep with their chin resting on the bolster.
• Good fit: dogs that like the feeling of an edge around them while they sleep.
• Partial fit: dogs that sleep stretched on their side. Their head and front legs will rest over the bolster, which many dogs are happy with and some are not.
• Not the right bed: a giant breed that wants to lie fully stretched out flat with its whole body inside the bed. That dog needs a flat mattress-style bed sized to its stretched length.

If you are unsure which group your dog is in, watch how it uses the couch or the edge of its current bed. A dog that hunts for an armrest is a dog that will use a bolster. A dog that always lies flat in the middle of the floor with its legs out is usually happier on a large flat bed.

Common sizing mistakes to avoid

• Measuring the dog standing up. Standing length tells you little about how much bed a sleeping dog takes up.
• Buying by the label. Small, Large and XL mean different things at different stores.
• Comparing the outer size of a bolster bed with your measurement. Use the inner sleep area.
• Buying for the puppy. A large-breed puppy outgrows a puppy-sized bed quickly, so size for the adult if you can.
• Forgetting the room. Measure the floor space as well as the dog, especially for a bolster bed with a large outer size.
• Assuming a bed will fit in a crate. Large bolster beds are usually too big for standard crates, so check the crate's inside floor dimensions first.
• Choosing size and ignoring support. A big bed with a thin base still leaves a heavy dog on the floor.

Get the size and the support right and the bed will be used. If you want specific recommendations for big, active dogs once you know your measurement, our buyer's guide covers what to look for in detail.

→ Related reading: the best orthopedic dog bed for large breeds