The answer to "what size dog bed do I need" starts with a tape measure: measure your dog from nose to base of tail while they're lying in their usual sleeping position, then add 6 to 12 inches. Compare that number to the bed's actual interior length on the listing, not to the S/M/L label. A dog that sprawls needs the bigger end of that range; a dog that curls into a ball can go smaller. Weight-based charts are a starting point, but length is what determines whether your dog fits.
It sounds like it should have a simple chart answer, and most stores give you one. The problem is that a 30-pound Corgi and a 30-pound Whippet have completely different lengths and sleep in completely different shapes. Here's how we'd measure, what to add, and how to read a bed listing.
What size dog bed do I need? Start by measuring
You need one main measurement and one observation.
- Sleeping length: Wait until your dog is asleep or resting the way they usually do. Measure from the tip of the nose to the base of the tail (not the tip). If your dog sprawls on their side with legs out, measure from nose to the tip of the outstretched back paws instead, because that's the space they actually take up.
- Sleeping style: Note whether your dog curls, sprawls, stretches flat, or leans against something. Curlers can use a bed near their length; sprawlers need more.
- Standing height (optional): For beds with raised sides, measure from the floor to the top of the shoulder. A bolster taller than your dog's chest can be hard for seniors to step over.
Then add room. A common guide is length plus 6 inches for curlers and plus 8–12 inches for sprawlers. That extra space is the difference between a bed your dog uses and one they lie next to.
How do you read a dog bed size chart?
Ignore the letter, read the inches. Most listings give either exterior dimensions, interior dimensions, or both, and the difference can be several inches once you account for bolsters.
As an example, our soft plush pet bed runs M through 2XL, with lengths from about 22 inches (M) to 39 inches (2XL) and raised sides on three edges. A dog that measures 24 inches nose to tail base and sprawls would want the XL (31.5 inches) rather than the L (25.6 inches), even though both might be labeled "for medium dogs" elsewhere.
Two things to check on any chart:
- Is the measurement interior or exterior? A 30-inch exterior bed with 4-inch bolsters has a 22-inch sleeping surface.
- Is there a weight reference? Weight guides are useful sanity checks. Our thickened oval plush pet nest, for example, lists both dimensions and a weight range per size (S to about 5.5 lb, up to XL around 38 lb). If length and weight point to different sizes, go with length.
Which bed style fits which sleeping position?
Shape matters almost as much as size.
- Bolster or "sofa" beds: Raised sides on some or all edges. Best for dogs who lean their head or back against something. Measure interior length.
- Flat mats and pads: No sides, easy to step onto, easy to move. Best for sprawlers, hot sleepers, and seniors with stiff joints. Also the easiest to measure: the whole surface is usable.
- Round or oval nests: Cozy for curlers. The usable diameter is often smaller than it looks because of the padded walls; check the interior measurement.
- Cave or hooded beds: For small dogs who burrow under blankets. Rare for large dogs. Measure both length and the height of your dog lying down so the roof isn't pressing on them.
- Orthopedic: A supportive foam base for seniors, large breeds, or dogs recovering from injury. Sizing works the same way; the difference is what's inside. We covered when it's worth the upgrade in orthopedic vs regular pet beds.
Should you size up if your dog is between sizes?
Usually yes, with one exception. Extra room in a bed is rarely a problem; too little room means the dog hangs off the edge and stops using it. Size up if your dog sprawls, is still growing, or shares the bed with another pet.
The exception is dogs who love to be snug. Some small dogs and many anxious dogs prefer a bed that hugs them, and a bed that's much too large loses that. For those dogs, a nest or bolster bed at the smaller end of the range often gets more use.
Puppies are their own case: buy for the adult size if you know the breed and can accept a big empty bed for a few months, or buy a cheap small bed now and the real bed at 9–12 months.
Does the same method work for cats?
Yes, and cats are more forgiving because they curl and squeeze into almost anything. Measure a cat nose to tail base while curled (usually 14–18 inches for an average adult), add a few inches, and check the interior of the bed. Many cats prefer a bed that feels slightly small. Dudu insists on a nest that Ai fits far better, and there's nothing we can do about it.
Other things to check before buying
- Removable, washable cover. Every bed gets dirty. A zip-off cover you can machine-wash doubles the bed's usable life.
- Fill type. Loose fiberfill flattens in months; foam holds shape longer. For light dogs, either is fine.
- Non-slip base. Useful on hardwood or tile, especially for dogs that jump into bed.
- Where it will go. Measure the spot, too. A bed that doesn't fit the crate or the corner you had in mind ends up in a hallway.
FAQ
How do I know what size bed to get my dog?
Measure your dog nose to tail base while they're lying down, add 6 to 12 inches depending on whether they curl or sprawl, and match that to the bed's interior length on the listing. Use weight charts only as a backup.
Should a dog bed be bigger or smaller?
When in doubt, slightly bigger. A bed that's a little too large still gets used; one that's too small gets ignored. The exception is dogs who like to feel snug, who often prefer a nest at the smaller end of their range.
What size bed does a 50 lb dog need?
Most 50-pound dogs measure somewhere around 26–32 inches nose to tail base and do well in a bed with a 34–40 inch interior, but the range is wide. A stocky Bulldog and a lanky Vizsla at 50 pounds need different beds, which is why measuring beats the weight chart.
Quick recap
What size dog bed do I need? Measure your dog's sleeping length, add 6–12 inches based on how they sleep, and compare to the bed's interior dimensions rather than the size label. Size up for sprawlers and growing dogs; size snug for curlers who like to feel held. Browse our dog and cat beds, each listed with measurements in inches. Orders over $75 ship free.
