The right size dog crate for a plane depends on whether your dog is flying in the cabin with you or traveling in the cargo hold. Airlines set their own rules, but most follow similar size and safety standards.
If your dog is flying in the cabin, you’ll typically need a soft-sided carrier that fits under the seat in front of you. Many airlines cap in-cabin carriers around 18″ x 11″ x 11″ (length x width x height), though limits can vary by aircraft and seat location. The carrier should allow your dog to stand up, turn around, and lie down comfortably, while still compressing slightly to slide under the seat.
For dogs traveling as checked baggage or cargo, airlines usually require a hard-sided, IATA-style kennel. There isn’t one “approved” crate size—your crate must be sized to your dog and meet airline construction requirements. As a general fit check, your dog should be able to stand without ears touching the top, turn around naturally, and lie down with room to stretch. Many owners end up in the ballpark of 28″ to 40″+ long crates for medium-to-large dogs, but the right choice comes down to your dog’s measurements and the airline’s kennel rules.
Measure your dog from nose to base of tail for length, floor to top of head (or ear tips) for height, and shoulder width for comfort. Then compare your measurements to the airline’s requirements before you buy—especially if you’re close to the limit.
Always confirm your airline’s current crate dimensions, weight limits, and pet policies for your specific flight. For cozy, travel-friendly carrier tips and a practical look at a popular option, visit this dog carrier guide.
Most airlines allow carriers around 18″ x 11″ x 11″, but the exact under-seat space varies by aircraft and seat. A soft-sided carrier is often easiest because it can flex to fit.
Many mini schnauzers fit well in a 24″ crate for home use, but sizing depends on your dog’s height and length. For flying in-cabin, you’ll need a carrier that meets your airline’s under-seat limits.
Sometimes, but usually not in the cabin. A 40 lb dog typically must travel in an airline-approved hard kennel as checked baggage or cargo, depending on the airline and route.
