What size crate does your dog need?
Pick the right crate the first time. Use adult weight for a quick answer, or body measurements for a precise fit. The crate should be big enough to stand, turn, and lie down — and no bigger.
Crate size calculator
Pick the right crate size from your dog's adult weight, or measure for a precise fit. The 4-inch rule: crate length must be your dog's nose-to-tail length plus 4 inches, and crate height must be standing head-height plus 4 inches.
Add body measurements for a precise fit (recommended)
How to measure: Length is nose tip to base of tail (where the tail starts, not the tip). Height is the top of your dog's head when they're sitting upright. Add 4 inches to each — that's the minimum crate interior.
Standard manufacturer dimensions: —.
How this number was calculated
Weight-based. Adult weight matched to standard crate manufacturer bands (Midwest Homes, Petmate, AKC sizing chart).
With measurements. The crate must be at least nose-to-tail length + 4″ long and standing height + 4″ tall. The smallest standard band meeting both is recommended.
Source: AKC Crate Sizing Guide; Midwest Homes for Pets sizing chart.
Crates we'd recommend at this size
The MidWest iCrate is the workhorse — included divider for puppies, durable wire construction. Pick the size matching the result above.
- MidWest iCrate 22"$30–40Standard, durable, includes the divider you need for a growing puppy.
- MidWest iCrate 30"$40–55Most common size for medium-breed adults.
- MidWest iCrate 36"$50–70Right for Border Collie / Aussie / similar.
- MidWest iCrate 42"$60–85Labrador / Golden / Boxer size.
Disclosure: As an Amazon Associate we earn from qualifying purchases. Affiliate revenue doesn\'t influence the math or recommendations on this site — every product listed is one we\'d suggest regardless. See editorial policy for the full position.
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Quick reference chart
| Crate size | Adult weight | Example breeds |
|---|---|---|
| 18" | Under 10 lb (4.5 kg) | Chihuahua, Yorkie |
| 22" | 10–25 lb (4.5–11 kg) | Pug, Shih Tzu, Boston Terrier |
| 24" | 20–30 lb (9–14 kg) | Cavalier, Beagle puppy |
| 30" | 25–40 lb (11–18 kg) | Beagle, French Bulldog, Cocker |
| 36" | 40–70 lb (18–32 kg) | Border Collie, Aussie, Springer |
| 42" | 70–90 lb (32–41 kg) | Labrador, Golden, Boxer, Pit Bull |
| 48" | 90–110 lb (41–50 kg) | German Shepherd, Doberman, Husky |
| 54" | 110+ lb (50+ kg) | Great Dane, Mastiff, Saint Bernard |
The 4-inch rule
Two measurements determine the right crate size:
- Length: nose tip to base of tail, plus 4 inches.
- Height: floor to top of head when sitting, plus 4 inches.
The 4-inch buffer gives enough room to stand up without crouching, turn around fully, and lie stretched out comfortably. Anything less is cramped; anything more starts to defeat the purpose of crating.
Why not buy "extra room"?
It seems intuitive that more space is more comfortable. But two practical problems:
Housetraining. Puppies and adult dogs that haven't been crate-trained will use one corner of a too-large crate as a toilet and sleep in another. The "no soiling where you sleep" instinct only works when the crate is sized so the dog can't avoid lying in the soiled spot. Right-sized crates are why crate training works for housebreaking — too-large defeats it.
Security signal. Crates work as calming refuges because they feel den-like — enclosed, safe, predictable. A 5×3 foot wire box doesn't feel like a den; it feels like a holding pen. Right-sized crates become a place dogs choose to rest in voluntarily, not a place they avoid.
Wire vs plastic vs soft-sided
Wire crates (Midwest, AmazonBasics): the default for home use. Best airflow, easiest to clean, fold flat for storage, includes a divider for puppies, sees what's happening in the room. Cons: clanky, can be visually busy.
Plastic kennels (Petmate Vari Kennel, Ruffland): airline-approved, more den-like, better noise dampening. The right choice for anxious dogs and for any air travel. Cons: harder to clean, limited airflow in summer, harder to fold/store.
- IATA Container Requirement 1: the dog must be able to stand fully erect with ears clear of the top, turn around without touching the sides, and lie down naturally. "Airline-approved" on the box doesn't guarantee this — measure your specific dog against the interior dimensions.
- Brachycephalic cargo bans: United, Delta, American, Lufthansa, KLM, and most other major carriers refuse to transport snub-nosed breeds in cargo (Bulldog, Pug, Boxer, French Bulldog, Boston Terrier, Persian, Exotic Shorthair, Himalayan). FAA mortality data 2010-2017 drove the policy. Cabin travel is the only safe option, and that means a soft carrier under the seat, not a hard kennel.
- Hot-weather embargoes: most airlines refuse cargo pet travel when ground temperature exceeds 85°F at any leg of the route. Check airline policy before booking; consider re-routing through cooler hubs.
Soft-sided (EliteField, etc.): lightweight travel-only crates for already-trained calm dogs. Never use for crate training, puppies, or chewers — they\'ll bite through fabric in minutes.
Furniture-style (end-table-shaped wooden crates): aesthetic upgrade for adult, fully-trained dogs. Not suitable for puppies or anxious chewers.
How long can a dog stay crated?
For adult dogs in good health, 6–8 hours during a workday is the upper limit, and only with morning and evening exercise on either side. Anything longer than that risks bladder discomfort, muscle stiffness, and behavioural frustration. Dogs sleeping overnight are fine for 8–10 hours because they\'re inactive.
For puppies, the rule of thumb is age in months + 1 = max hours:
- 2-month-old: 3 hours max
- 3-month-old: 4 hours
- 4-month-old: 5 hours
- 6-month-old: 7 hours
If your workday exceeds these limits, hire a midday walker, use doggy daycare, or switch to an exercise pen (X-pen) that allows a designated potty area separate from the sleeping area.
Common myths
"Crating is cruel." Correctly used, no. Dogs are den animals; a properly-sized crate that\'s been conditioned positively becomes a chosen refuge. The cruelty is misuse: punishment, all-day confinement, or no exercise. Used as a tool, it\'s welfare-positive.
"My dog will grow out of crating." Many do — adult dogs that are reliably housetrained and don\'t chew often graduate to free-roaming. But keep the crate available; many dogs continue to choose it for naps even when they\'re no longer required to use it.
"You can\'t crate-train an older dog." You can, but it takes longer. Start with very short positive sessions (food rewards inside, door open) and build up. Most adult rescues can be crate-trained in 2–4 weeks of consistent work.
Sources: American Kennel Club Crate Sizing Guide. Midwest Homes for Pets — Crate Sizing Chart. ASPCA — Weaning Your Dog Off the Crate. AKC GoodDog! Helpline.
Frequently asked questions
What size crate does my dog need?
It depends on adult weight and body length. The general guide: under 10 lb → 18", 10–25 lb → 22", 25–40 lb → 30", 40–70 lb → 36", 70–90 lb → 42", 90–110 lb → 48", 110+ lb → 54". Use the calculator above and enter actual body measurements for the most accurate fit.
How do I measure my dog for a crate?
Two measurements matter: (1) Length — nose tip to base of tail (where the tail starts, not the tip). (2) Height — top of head when your dog sits upright, measured from the floor. Add 4 inches to each. That's your minimum crate interior. The standard manufacturer size that meets or exceeds those numbers is the one to buy.
Should I buy bigger than recommended for comfort?
No — and this is a common mistake. The crate should be big enough that your dog can stand without crouching, turn around, and lie down comfortably. But not significantly bigger. Too much room defeats two important purposes: (1) housetraining (puppies will use one corner as a bathroom if there's space), and (2) the den-like security that makes crates a calming refuge rather than a holding pen. "Just enough" is correct.
I have a puppy. Should I buy a small crate now or a big one for later?
Buy the adult-sized crate now and use a divider panel to shrink the interior. Almost every wire crate sold today includes a divider — adjust it as your puppy grows. Buying multiple crates as your puppy grows is expensive and unnecessary. The exception is very small toy breeds where adult size is fully reached in 6–9 months.
Are wire crates or plastic kennels better?
Different purposes. Wire crates are best for home use — better airflow, easier to clean, fold flat for storage, dividers for puppies. Plastic kennels (Petmate Vari Kennel, etc.) are airline-approved and feel more den-like, which suits anxious dogs but limits airflow in summer. Soft-sided crates are travel-only — never use them for crate-training puppies or for dogs who chew at fabric.
How long can my dog stay in a crate?
Adult dogs: up to 6–8 hours during the workday, but with morning and evening walks, never longer. Puppies: a useful rule of thumb is one hour per month of age, plus one — so a 3-month-old puppy can hold it for ~4 hours, a 4-month-old for ~5 hours. Overnight is usually fine because they're asleep, but daytime stretches longer than this risk house-soiling and behavioural distress.
My dog hates the crate. What should I do?
Most "crate-hating" comes from being forced into one cold without conditioning. Restart from scratch: leave the crate door open, throw treats inside, feed meals inside (door open), then gradually start closing the door for very short periods (10 seconds, then 30, then 1 minute) with rewards. Never use the crate as punishment. Some breeds (Border Collies, Huskies) and rescues with kennel trauma may never love crates — for those, a baby-gated room or pen is a better alternative.
Do giant breeds really need 54" crates?
Yes — Great Danes, Mastiffs, Saint Bernards genuinely need them. A 110+ lb dog cramped in a 48" crate will refuse to use it. Giant-breed crates are expensive (often $200–500) and bulky, which is one reason crate-training large breeds requires upfront commitment. Some owners use baby-gated rooms instead, which is a reasonable alternative.
What about cat crates?
Cats use carriers, not crates — the typical small cat carrier (sized for vet trips) is fine for transport. Long-term confinement of cats in crates is generally inappropriate; cats kept indoors should have free range of at least one room. Hard-sided carriers with top-loading access are the most cat-friendly design — most cats hate being shoved through a side door. The Sleepypod is widely considered the gold-standard cat carrier.