What Size Crate for Medium Dog? | 30″ Is Usually Right

Choosing the right crate for a medium dog comes down to one measurement rule: your dog’s length from nose to tail base, plus 2–4 inches of clearance. That number, not breed label or weight, tells you which crate size actually fits. Most Beagles, Cocker Spaniels, French Bulldogs, and Corgis land in the 30-inch range, while longer-bodied breeds like Border Collies often need 36 inches.

How Crate Sizing Works for Medium Dogs

Crate size is determined by the dog’s body measurements, not their weight class. PetMD’s crate-sizing guidance recommends measuring your dog in two directions: length from the nose to the base of the tail, and height from the floor to the top of the head while sitting. Add 2–4 inches to both numbers, and the larger of the two results tells you the minimum interior length your crate needs.

For context, most sizing charts place medium dogs between 26 and 40 pounds. Dogs that run longer or taller within that weight range — think Bulldogs with their deep chests or Corgis with their stretched backs — should move up to 36 inches.

Testing the Fit Before You Commit

The real test happens after the crate arrives. A properly sized crate lets your dog stand up without crouching, turn around comfortably, and lie down fully stretched out. If any of those three movements is restricted, the crate is too small. If your dog has several inches of extra space beyond the recommended clearance, the crate is too large — which matters more than most owners expect.

Too much empty room can make a crate feel less secure, which often defeats the purpose of crate training. At the same time, a cramped crate causes real discomfort. Size to the individual dog, not the breed label on the bag of food or the weight range on the chart.

One compatibility note worth knowing: retailers don’t always agree on what “medium” means. Always check the interior dimensions listed on the specific crate you’re considering, and compare them to your dog’s measurements.

Common Medium Breeds and Their Crate Sizes

These are starting points — your dog’s individual measurements overrule any chart.

Notice the pattern: longer-bodied breeds need the bigger crate even at similar weights. A Corgi and a Beagle might weigh nearly the same, but the Corgi’s stretched frame needs the extra length. Measure your dog, then verify the crate’s interior dimensions against your numbers.

If you’re comparing specific crate models and want to see which ones hold up for medium dogs, our tested roundup of the best crates for medium dogs covers durability, portability, and fit across the most popular options.

Measuring Your Dog Correctly

Grab a flexible tape measure and have your dog stand on all four paws. Measure length from the tip of the nose to the base of the tail — not the tip of the tail, which would add inches you don’t need. For height, measure from the floor to the top of the head when your dog is sitting naturally. Add 2–4 inches to each number. The larger result is the minimum interior crate length you need.

When a crate’s listed dimensions are exterior rather than interior, subtract a few inches to account for wall thickness and door hardware. Petco’s dog crate guide recommends checking the interior space specifically, since that’s the space your dog actually occupies.