Dog Crate Size Calculator

How to measure your dog for a crate

Ignore the size label on the box and measure the dog. Crate sizes vary between brands, and a "large" from one manufacturer can be four inches shorter than a "large" from another. What matters is that the crate is long enough for the dog to lie down stretched out, tall enough to stand up without ducking, and wide enough to turn around.

Take three measurements with the dog standing on a hard floor:

Those additions are not padding for comfort, they are what lets the dog stand, turn and lie flat. A crate that exactly matches the dog's length forces it to sleep curled up, and a crate that matches its height makes it duck every time it moves. The American Kennel Club publishes crate sizing guidance for common breeds, and the ASPCA covers crate training and how to introduce one.

The calculator above takes your three measurements, adds the clearance, and rounds up to the next standard crate size, so you buy one crate instead of three.

Worked example: a 50 lb medium-sized dog

A 50 lb mixed breed, say a labrador-cross, measures 22 inches nose-to-tail, 24 inches to the top of the head, and 10 inches across the shoulders.

• Minimum crate length: 22 + 3 = 25 inches
• Minimum crate width: max(10 + 3, 22 x 0.72) = 16 inches
• Minimum crate height: 24 + 3 = 27 inches
• Smallest standard size that clears all three: Large, 42 x 28 x 30 inches

It looks like overkill on length, the dog needs 25 inches and the crate is 42. But look at the height: the dog needs 27 inches and the Small crate is only 21 inches tall, the Medium only 25. A dog that cannot stand up straight in its crate is uncomfortable and more likely to resist going in. The Large is the first standard size that clears the height requirement, so that is the answer.

This is why sizing by weight alone goes wrong so often. A 50 lb dog that is short and stocky might fit a Medium, while a 50 lb dog that is tall and leggy needs the Large. Weight tells you roughly where to start; the measurements tell you where to finish.

Worked example: an 85 lb large-breed dog

Now a bigger case: an 85 lb dog measuring 36 inches nose-to-tail, 32 inches to the top of the head, and 12 inches across the shoulders.

• Minimum crate length: 36 + 3 = 39 inches
• Minimum crate width: max(12 + 3, 36 x 0.72) = 26 inches
• Minimum crate height: 32 + 3 = 35 inches
• Size class: Extra extra large, 54 x 35 x 45 inches

The length only needs 39 inches, which the 42-inch Large and the 48-inch XL both clear. The height is the problem, 35 inches needed, and the XL is only 33 inches tall. So the correct crate is the 54-inch XXL, which is a big, heavy, expensive crate, and buying the wrong one first is a costly mistake.

For dogs this size, measure before you buy and check the interior height, not the exterior. A crate with a raised floor pan or thick bedding can lose an inch or two of usable height, and that is the difference between standing and crouching.

Standard crate sizes and the dogs they fit

These are the common sizes sold in the US, with the dog weights and breeds they usually suit. Use them as a starting point, then check your own measurements against the interior dimensions.

Two caveats. First, brands differ: a 42-inch crate from one maker can have a 26-inch interior height while another's is 31 inches. Always check the interior dimensions, and if you can, take your dog to the store and watch it walk in and turn around. Second, weight ranges overlap on purpose, a slim 45 lb dog and a stocky 45 lb dog need different crates. The American Veterinary Medical Association has broader guidance on crate use and confinement if you want the veterinary view.

Puppy crates: buy the adult size, use a divider

The puppy crate question is where most owners spend money twice. The instinct is to buy a small crate for a small puppy. The problem is that a puppy grows out of it in three months, and a crate that is much bigger than the puppy is also bad for house-training.

The reason is simple: dogs naturally avoid soiling the place they sleep. A puppy in a crate that is just big enough will hold it. A puppy in a crate twice its size has room to use one corner as a bathroom and sleep in the other, and that habit is hard to break once it forms.

So the correct answer is both: buy the crate your dog will need as an adult, and use a divider panel to shrink the usable space down to puppy size. Move the divider back as the dog grows, and by the time it is fully grown you have the right crate with no second purchase.

For the puppy's adult size, ask your breeder or vet for the expected adult weight, then work backwards from the breed's typical adult measurements. If the dog is a mixed breed, the paw size and the parents are the best guides. A crate sized for the adult is a five-minute calculation and saves $80 to $200 later.

Why the crate should not be too big or too small

Too small is the obvious problem: a dog that cannot stand up, turn around or lie flat is uncomfortable, may develop pressure sores on the elbows, and will resist going in. In long-backed breeds, a crate that is too short encourages a hunched posture that is bad for the spine. If your dog can touch both ends with its nose and tail at the same time while standing, the crate is too short.

Too big causes different problems. For a puppy, it undermines house-training as described above. For an adult dog, a large crate can feel less secure, many dogs settle faster in a space that feels den-like rather than cavernous. And a big crate takes up a big footprint in your home, which matters more than people expect in an apartment.

There is also a safety angle for travel. In a car, a crate should be small enough that the dog cannot be thrown around inside it during a sudden stop. That is a different requirement from a home crate, and it is why travel crates are usually a size down from the home crate, or a crash-tested carrier that is matched to the dog's weight.

Choosing between wire, plastic and soft-sided crates

The size is the same whichever type you choose, but the material changes how you use it. Wire crates are the most common: they fold flat, they ventilate well, they come with divider panels, and the dog can see out. They are the default choice for home use and house-training. Their downside is that they offer little insulation and a determined chewer can bend the bars.

Plastic airline crates are enclosed, warmer and darker, which suits dogs that like a den. They are usually the only type accepted for air travel and they are more crash-resistant than wire in a car. They do not fold as small, they are harder to clean, and a dog cannot see out as easily.

Soft-sided crates are light and pack down for travel and hotel stays, but they are not for chewers, a determined dog will go through the mesh. They work well for a calm, crate-trained adult on the road and poorly for a puppy in the chewing stage.

Whichever you choose, the measurements are what matter. Get the interior dimensions right, add bedding that leaves room to stand, and check that the door opening is wide enough for your dog to walk through without ducking. A crate that is correct on paper but has a narrow door is still the wrong crate.