How big should a dog crate be? Big enough for your dog to stand without ducking, turn around easily and lie stretched out on their side, but not much bigger. Measure your dog from nose to base of tail and from floor to top of head while standing, then add 3 to 4 inches to each.
That gets you the crate. But a crate is rarely used bare: most people add a pad and, with wire crates, a cover. Those have to fit too, and a "42-inch crate" is not 42 inches on the inside. This guide sizes all three together, with a chart you can use in the store.
How to measure your dog for a crate
Have someone hold your dog still with a treat, use a soft tape measure, and measure twice.
- Length: with your dog standing, measure from the tip of the nose to the base of the tail. This is the method Whole Dog Journal describes (Whole Dog Journal). AKC measures to the tip of the tail instead, which gives a roomier result for long-tailed breeds.
- Height: with your dog standing naturally, measure from the floor to the top of the head (or the tips of the ears if they stand upright).
- Add room: AKC suggests adding 3 to 4 inches to each measurement to get the crate length and height you need (AKC).
- Allow for the pad: bedding raises the floor. Whole Dog Journal notes bedding can take an inch or so of height, so check headroom with the pad you plan to use, especially with thick foam.
Weight is a rough guide at best. Whole Dog Journal advises against choosing on weight alone, because two dogs of the same weight can be very different shapes. A long, low dog and a compact, leggy dog may need different crates even if the scale says the same thing.
Worked example
Your dog measures 25 inches from nose to base of tail and 20 inches tall at the head. Add 3 to 4 inches: you need roughly 28 to 29 inches of length and 23 to 24 inches of height. A 30-inch crate is the closest common size, as long as its interior height clears 23 inches with the pad in place. If it doesn't, go up to the next size.
Dog crate size chart: how big should a dog crate be?
Crates are sold by nominal length. The chart works backward from AKC's add-3-to-4-inches rule, using the more conservative 4 inches because interiors run smaller than the label (see the next section). Height still needs its own check.
| Crate size (nominal length) | Fits a dog measuring up to (nose to base of tail) | Often fits adults of (individuals vary) |
|---|---|---|
| 18 in | 14 in | Toy breeds and young toy-breed puppies |
| 22 in | 18 in | Chihuahua, Yorkshire Terrier, Maltese |
| 24 in | 20 in | Shih Tzu, Pug, Bichon Frise |
| 30 in | 26 in | Beagle, French Bulldog, Cocker Spaniel |
| 36 in | 32 in | Border Collie, Bulldog, Australian Cattle Dog |
| 42 in | 38 in | Labrador Retriever, Golden Retriever, Boxer |
| 48 in | 44 in | German Shepherd, Rottweiler, large Labradors |
| 54 in | 50 in | Giant breeds such as Great Danes and Mastiffs |
If your dog falls between sizes, size up. A crate that's slightly roomy is easier to fix (with a divider or a thicker pad) than one that's too small.
Nominal vs interior dimensions: why a 42-inch crate isn't 42 inches inside
The size on the box usually describes the crate's outside footprint. Inside, you lose space to the wire frame, door latches, corner posts and the lip of the plastic tray. The floor your dog actually lies on, and the space your pad has to fit, is a bit smaller than the label.
That's fine for the dog, because the chart above already builds in a margin. It matters more for accessories:
- Pads should be sized to the tray, not the label. A pad cut to the nominal size will curl up at the edges or not lie flat.
- Covers should be sized to the outside of the crate, so the label (or your own outside measurement) is the right number.
- Brands differ. Two "36-inch" crates can have different heights and widths. Measure your own crate rather than trusting a generic size.
How to size a crate pad or bed
"Dog bed for crate" and "what size crate pad do I need" are really the same question: what fits the tray?
- Pull out the tray, or measure inside the crate at floor level, wall to wall in both directions.
- Choose a pad equal to or slightly smaller than those numbers. A pad that is too large will buckle and invites digging and chewing at the raised edge.
- Subtract the pad's thickness from the crate's interior height and check that your dog can still sit and stand comfortably.
- Choose the cover type for the job: washable for puppies and accident-prone dogs, waterproof for car and outdoor use, plush for older dogs who want cushioning.
Some starting points from our crate pad range (always compare the listed dimensions with your own tray measurement):
| Pad | Size options | Best for |
|---|---|---|
| Washable foam crate pad | M: 29.9 × 20.1 × 3 in, shaped to fit inside a medium wire crate | Dogs past the chewing stage who want real cushioning; check headroom for the 3-inch foam |
| Waterproof crate pad with washable cover | S, M | Crates that also go in the car or outdoors; flannel top with a wipe-clean base |
| Fluffy plush crate pad | S, M, L, XL, 2XL | Dogs who like to curl up; non-slip, water-resistant base |
| Plush thick crate mat | 17.7 × 23.6 in or 27.6 × 27.6 in | The smaller size suits compact crates; the square size suits pens and wider kennels better than long crates |
For puppies, go thinner and more washable first and save the thick foam for later; our crate training guide explains bedding by stage. See every option in our crate pads and mats collection.
How to size a crate cover for a wire crate
AKC notes that fabric covers on wire crates can give a dog extra privacy (AKC). For a cover, measure the outside of the crate: length, width and height. The cover should match those numbers or be very slightly larger; one that's too big sags into the crate where it can be pulled and chewed, and one that's too small won't reach the floor.
Our Oxford-fabric crate cover for wire kennels comes in four sizes:
| Cover size | Cover dimensions (L × W × H) | Typical crate match |
|---|---|---|
| S | 25 × 18.9 × 20 in | 24-inch wire crates |
| M | 31.1 × 20 × 20.9 in | 30-inch wire crates |
| L | 37 × 24 × 25 in | 36-inch wire crates |
| XL | 42.9 × 29.1 × 29.9 in | 42-inch wire crates |
Because crate heights and widths vary by brand, compare all three of your crate's outside measurements with the cover, not just the length. Leave at least one side open or rolled up for airflow.
Puppies: buy for the adult, then use a divider
For a puppy, AKC recommends a crate as large as the typical adult size of your dog's breed, with a divider you adjust as your puppy grows (AKC). The reason is house training: in a crate that's too large, a puppy can eliminate at one end and sleep at the other (AKC).
- Set the divider so your puppy can stand, turn and lie stretched out, with a few inches to spare.
- Re-measure every couple of weeks during growth spurts and move the divider back.
- Size the pad to the divided space, not the full tray. A small washable mat now and a full-size pad later is cheaper than replacing a chewed full-size pad.
- For mixed breeds where adult size is a guess, size up; a divider fixes too much space, but nothing fixes too little.
Planning the rest of the setup? Our new puppy checklist covers what to buy before day one, and the dog bed size guide uses the same measurements for beds outside the crate.
Is the crate too big or too small? Quick checks
| Sign | What it means | Fix |
|---|---|---|
| Head brushes the top when sitting or standing | Too short, or the pad is too thick | Thinner pad, or a taller crate |
| Can't lie flat on the side without curling | Too short | Next size up |
| Turns around with difficulty or hits the sides | Too narrow | Next size up or a wider model |
| Accidents at one end, sleeps at the other | Too large, especially for a puppy | Add or move the divider |
| Restless, won't settle, seems exposed | Possibly too large or too open | Divider, pad, or a cover over the back and sides |
Whole Dog Journal sums up both sides: a crate that's too small can cause stress and discomfort, while one that's too large may not feel secure and can make training harder (Whole Dog Journal).
Frequently asked questions
How big should a crate be for a dog?
Your dog should be able to stand without ducking, turn around easily and lie stretched out on their side. Measure nose to base of tail and floor to top of head while your dog stands, then add 3 to 4 inches to each. If your dog falls between sizes, choose the larger crate and use a divider or pad to fill space.
What size crate for a 20 lb dog?
It depends on your dog's shape more than the scale. A compact 20-pound dog may fit a 24-inch crate, while a longer-bodied dog of the same weight may need 30 inches. Measure length and height, add 3 to 4 inches, and check that the interior height still works with a pad.
Should dogs sleep in crates?
Many dogs happily sleep in a crate, especially puppies who are house training, because a correctly sized crate feels like a den. It isn't required for every adult dog. If your dog is reliably house-trained and calm loose at night, a bed works too. Never use the crate as punishment.
How do you know if a crate is too small?
Watch your dog inside it. If their head brushes the top when they sit, they can't turn without bumping the sides, or they can't lie flat on their side with legs extended, the crate is too small. A thick pad can make a borderline crate too short, so check with the bedding in place.
Found your size? Match a washable or waterproof pad to your crate tray and a fitted cover to its outside in our crate pads and mats collection. Once you know how big your dog crate should be, the rest is easy: orders over $79 ship free and ship within 3 to 5 days with tracking.