Garden 
Affiliate Disclosure
Some links on this page are affiliate links. As an Amazon Associate, we earn from qualifying purchases — at no extra cost to you. We do not buy, test, or physically handle the products we cover; our rankings come from aggregated owner reviews, ratings and expert consensus. Commissions never change our verdicts. How we rank · full disclosure.
Measure your dog standing — nose to the base of the tail for length, floor to the top of the head for height — and add 2 to 4 inches to each. That is your crate size. As a shortcut by adult weight: up to 10 lb takes an 18-inch crate, 12 to 20 lb a 24-inch, 21 to 40 lb a 30-inch, 41 to 70 lb a 36-inch, 71 to 90 lb a 42-inch, 90 to 110 lb a 48-inch, and over 100 lb a 54-inch. For a puppy, buy the adult size and use the divider panel — a crate with spare room quietly undermines house-training.
The crate size chart
Weight bands are a proxy for body dimensions, and they work for most breeds. Treat this as a starting point and confirm it against your own measurements — particularly for anything tall.
| Crate length | Adult weight | Typical breeds | Divider needed? |
|---|---|---|---|
| 18 in | Up to 10 lb | Chihuahua, toy poodle, yorkshire terrier | Rarely |
| 24 in | 12–20 lb | Pug, boston terrier, jack russell, dachshund | Yes for a growing puppy |
| 30 in | 21–40 lb | Beagle, cocker spaniel, corgi, french bulldog | Yes |
| 36 in | 41–70 lb | Border collie, boxer, springer, standard poodle | Yes |
| 42 in | 71–90 lb | Labrador, golden retriever, german shepherd | Yes — essential for a lab puppy |
| 48 in | 90–110 lb | Rottweiler, doberman, malamute, greyhound | Yes |
| 54 in | Over 100 lb | Great dane, saint bernard, giant breeds | Yes |
How to measure, in three numbers
- Length. Nose tip to the base of the tail, with the dog standing. Measuring to the tip of the tail is the single most common error and it can add a foot to a retriever.
- Height. Floor to the top of the head, standing. For breeds with erect ears, measure to the ear tips — this is the standard airlines apply, and it is the safer figure at home too.
- Width. Across the shoulders at the widest point. Rarely the limiting dimension in a rectangular crate, but worth knowing for a broad-chested dog.
Add 2 to 4 inches to length and height. Then check what the crate listing is actually quoting — some publish exterior frame dimensions, which can differ from the usable interior by an inch or more per side.
For a puppy, do not measure the puppy. Look up the breed's expected adult weight, or ask your veterinarian or the breeder, and buy for that. A mixed-breed puppy of unknown parentage is the one case where renting or buying second-hand makes sense — humane organizations note that some animal shelters rent crates so you can trade up as a puppy grows.
The three-part fit test
Once the crate is up, the dog decides whether you got it right. The functional standard is the same one written into the federal transport rules — 9 CFR 3.15(e)(1) requires enough space "to turn about normally while standing, to stand and sit erect, and to lie in a natural position" — and it breaks down into three checks:
- Stand. The dog stands up fully without ducking their head or hunching their shoulders.
- Turn. The dog turns around in place without having to reverse or contort.
- Lie flat. The dog lies fully on their side with legs extended, not permanently curled because there is no room to stretch.
If any of those fails, the crate is too small. If all three pass with obvious room to spare and the dog is not yet house-trained, the divider needs to come in.
Why an oversized crate is a real problem
This is the part almost nobody is told, and it is the reason "get the biggest one you can afford" is bad advice for a puppy.
Crate training works because puppies avoid soiling the place they sleep. That instinct is the entire mechanism — it is what makes a crate a house-training tool rather than just a box. Give a puppy a crate with a spare half, and the instinct is satisfied without any behavior change: they eliminate at the far end and sleep at the near end, perfectly content, having learned nothing about holding on. Owners who describe a puppy who "just won't stop going in the crate" are very often describing a crate that is too big.
Hence the divider panel, which is included with essentially every wire crate in the growing sizes. Set it so the puppy has the three-part fit and no more, and move it back an inch or two every couple of weeks as they grow. It is a five-second adjustment and it is the difference between one crate and three.
The exception is a travel crate for a flight. There, a crate that is slightly generous is fine while a crate that is slightly tight can be refused at the check-in counter, so size up rather than down — see our travel crate guide for the full requirements.
Tall breeds break the weight chart
Weight-based sizing assumes a roughly proportional dog, and several popular breeds are not.
| Breed | What the weight chart says | What the dog actually needs | Why |
|---|---|---|---|
| Greyhound / whippet | 42 in | 48 in | Tall and long-legged for the weight |
| Great dane | 48 in | 54 in | Standing height, not floor area, is the constraint |
| Standard poodle | 36 in | 36–42 in | Leggy; measure to the top of the head |
| German shepherd | 42 in | 42–48 in | Erect ears; measure to the ear tips |
| Dachshund | 24 in | 24–30 in | Long body for a small weight |
| Bulldog | 30 in | 30 in, wider model | Broad chest; width is the limit, not length |
The rule that resolves all of these: when the height figure and the weight figure disagree, buy on height. A dog who cannot sit up straight is in a crate that is too small, whatever the label says.
Crates with the sizing built in
Best for buying the adult size once and shrinking it with the divider
- Seven lengths from 18 to 54 inches
- Divider panel included at every growing size
- Folds flat with carry handles
- Leak-proof slide-out tray
Why buy it: the divider is what makes the sizing question answerable — buy for the adult dog, wall off most of it today, and move the panel back every few weeks.
Best for the same sizing logic for less money, for a calm dog
- Full size range with dividers at growing sizes
- Two slide-bolt latches per door
- Removable composite tray
- Folds flat
Why buy it: sizing is a measurement problem rather than a brand problem, and if the dog does not lean on doors the cheaper crate solves it identically.
The full field, with construction and latch comparisons, is in our best dog crate roundup, and the large and extra-large end is covered separately in best crates for large dogs.
Sizing the bed inside the crate
One follow-on that catches people out: a bolster bed dropped into a correctly sized crate can eat the headroom the dog needs to stand up, which turns a correct crate into a small one. Use a flat crate pad rather than a bolster bed inside a crate, measure the crate tray rather than the dog, and keep the pad thin enough that the standing test still passes with it in. Our dog bed picks include the crate-mat options, and washing frequency is worth reading before you buy anything that is not machine washable.
The short version
Measure the dog standing, add 2 to 4 inches to length and height, and confirm the three-part fit — stand, turn, lie flat. Use the weight chart as a starting point but buy on height whenever the two disagree. For a puppy, buy the adult size and shrink it with the divider, because an oversized crate quietly sabotages house-training. And use a flat pad rather than a bolster bed inside, so the crate you measured is the crate the dog actually gets.
We never buy, test or physically handle the products we rank. Recommendations come from aggregated owner reviews, star ratings, review volume and expert consensus — see how we rank.
More from this hub: Pets at Home · Best dog crates · How to crate train a puppy · How long can a dog be crated · Best travel crates · How we rank