A “medium” pet carrier typically fits small to medium pets up to about 15–20 lb, but dimensions vary by brand. As a guide, a medium soft-sided carrier is often around 17–18 in (L) x 10–11 in (W) x 11–12 in (H). Medium hard-sided carriers tend to be larger, commonly in the 22–24 in (L) x 14–16 in (W) x 13–16 in (H) range.
Measure your pet’s length from nose to base of tail and add 2–3 inches for comfort. For height, measure from floor to top of shoulders (or head/ears if they sit upright) and compare to the carrier’s interior height. Your pet should be able to stand up, turn around, and lie down comfortably without being cramped.
If you’re flying, always verify your airline’s under-seat limits, which are often smaller than everyday “medium” sizes. Many airlines cap soft-sided carriers near 18″ L x 11″ W x 11″ H, but requirements vary. Choose by the stricter of two limits: your pet’s measurements or the airline’s dimensions.
Look for breathable panels, secure closures, supportive bases, and durable materials that keep your pet comfortable and safe. For a cozy, stylish carrier option and detailed measuring tips, see our full guide: Dog Carrier Bag “Tote’n’Go” Canvas Guide.
A medium crate typically suits dogs around 25–40 lb with a body length of roughly 24–30 inches. Always measure your dog from nose to base of tail and add 2–4 inches for a comfortable fit.
Most airlines allow soft-sided carriers around 18″ L x 11″ W x 11″ H, but limits vary by carrier and aircraft. Check your airline’s pet policy and measure your pet to ensure both fit.
Look for a roomy medium carrier with a sturdy base, typically around 18″ L x 11″ W x 11–12″ H for soft-sided, or 22–24″ L for hard-sided. Prioritize interior height so your cat can stand and turn comfortably.
