The four measurements
Measure your dog standing on all four legs, with a soft tape:
- A: from the tip of the nose to the base of the tail (not the tip).
- B: from the floor to the elbow joint.
- C: width across the widest part of the shoulders.
- D: from the floor to the top of the head or the ear tips, whichever is higher.
The IATA formula for air travel
Airlines follow the International Air Transport Association (IATA) Live Animals Regulations. The crate’s inside dimensions must be at least:
- Length = A + ½ × B
- Width = 2 × C
- Height = D
The dog must be able to stand without its head touching the roof, turn around and lie down in a natural position. Crates for the hold must also be rigid, ventilated on several sides, closed with a secure metal door and fitted with food and water bowls that can be filled from outside.
Worked example
A Labrador measures A = 28 in, B = 12 in, C = 8 in, D = 26 in.
- Length: 28 + 12 ÷ 2 = 34 in.
- Width: 2 × 8 = 16 in.
- Height: 26 in.
- For a home crate, add about 4 in to A: 32 in, so buy the next standard size, a 36-inch crate.
Home crate sizes
Wire and plastic home crates are sold by length:
| Crate | Typical dogs |
|---|---|
| 18 to 22 in | toy breeds, cats |
| 24 in | small dogs up to about 25 lb |
| 30 in | medium dogs, 25 to 40 lb |
| 36 in | medium-large dogs, 40 to 70 lb |
| 42 in | large dogs, 70 to 90 lb |
| 48 in and up | very large and giant breeds |
These weight ranges are only a guide; your dog’s length and height matter more than its weight.
Tips
- Puppies: buy the adult size with a divider panel and move it as the puppy grows.
- Check the inside size. Listed sizes often refer to outside dimensions.
- Flying: check your airline’s limits, fees and temperature embargoes before booking, and get your dog used to the crate weeks in advance.
- Never use a crate so small that the dog cannot stand up or turn around.