How to Choose Kennel Size for Dog | Measure Once, Buy Right

The wrong crate size is the most common mistake new dog owners make. A crate that’s too small cramps the dog’s joints and makes crate training miserable. A crate that’s too large gives them room to use one end as a bathroom, ruining housebreaking. Weight and breed charts are starting points — your actual dog’s measurements are the only numbers that matter. Here’s how to get them right on the first try.

How To Measure Your Dog For A Crate

Two measurements decide the fit: length and height. Take both with the dog standing in a natural, square posture. A soft measuring tape works best — a rigid one is fine if you hold it level.

Length measurement

Run the tape from the tip of the dog’s nose straight back to the base of the tail where it meets the body. Petmate’s official sizing guide warns against including the tail tip in this measurement — doing so produces a crate so large that a puppy can sleep on one side and eliminate on the other, defeating house-training goals.

Height measurement

Measure from the floor straight up to the top of the dog’s head while the dog stands in its tallest natural posture. If the dog sits, there must be at least 2 inches of clearance above the head per PetMD’s guidelines.

Add the clearance

These added inches are what turn a tight box into a comfortable den.

Weight-Based Crate Size Chart

The table below shows PetMD’s standard sizing by weight range and typical breeds. Match these numbers to your dog’s actual measurements — if the two conflict, trust the tape measure.

These rows cover the most common medium-to-large breeds. A Beagle or French Bulldog fits the 30-inch range, a Labrador falls into the 36-inch crate, and a Bernese Mountain Dog needs the 48-inch option.

What About Puppies? Buy For The Adult Size

Buying a crate for a puppy’s current size means buying another crate later. MidWest Homes for Pets and Carlson Pet Products both recommend purchasing a crate sized for the dog’s expected adult weight and using a divider panel to shrink the usable space while the puppy is small.

Divider panels are included with brands like MidWest Homes for Pets crates and Carlson Double-Door Dog Crates. You install the panel a few inches behind the puppy, leaving just enough room to stand, turn, and lie down. As the dog grows, you slide the panel back. When the dog reaches full size, you remove the panel completely.

For mixed-breed puppies, check the American Kennel Club (AKC) site for the breed’s typical adult range, or ask the veterinarian who saw the parents. A rough rule: the puppy’s paws and ears offer clues about final size.

Outdoor Kennel And Run Sizing

For dogs that spend significant time outdoors, the space needs are larger. Vandyke Outdoors specifies a single large dog run starts at 6×10 feet (60 square feet). The ideal setup for a dog outside for extended periods is 8×12 feet (96 square feet) to allow natural movement.

When two dogs share a run, take the size needed for the largest dog and add 50 to 100 percent more square footage. Two dogs that each need 96 square feet should have at least 144 square feet together — the extra space reduces competition and stress.

Common Sizing Mistakes That Sabotage Crate Training

Three errors cause most crate problems, and they all come from ignoring the dog’s actual body dimensions.

• Measuring the tail tip. Including the tail in the length measurement creates a crate so oversized that house-training suffers — the dog uses the extra space as a bathroom zone.
• Sizing by weight alone. A 50-pound Lab mix may need a 36-inch crate while a 50-pound English Bulldog fits a 30-inch. Breeds vary in body shape; the tape measure overrides the scale.
• Assuming bigger is better. Dogs are den animals that prefer snug, cave-like spaces. An oversized crate causes anxiety and actually encourages elimination inside the living area. The industry standard “snug but not tight” fit is what makes a crate feel safe.

If you are buying for a large breed that will reach the 42-inch category or beyond, check out our best large dog kennels roundup for models with the build quality and divider options those sizes demand.

How To Check Your Fit Before You Buy

PetMD’s professional animal care guidelines recommend the kennel interior be 1.0 to 1.5 times the dog’s body length, with 2 to 7 extra inches for bedding and natural movement. A quick test: your dog should be able to stand without hunched shoulders, turn around without scraping the walls, and lie flat on their side with legs extended. If any of those three postures is restricted, go up one crate size.

Also account for crate mats and dog beds — thick bedding takes up interior height. A crate that fits without a bed may be too tight with a 2-inch memory foam pad inside.

When A Crate Is Too Small: The Health Risks

A crate that forces a dog to stay curled or hunched for hours creates measurable health problems. The same PetMD source notes that undersized crates contribute to cramping, early-onset arthritis, and circulatory issues because the dog cannot fully extend its limbs. The fix is not “buy a bigger crate next month” — it’s “buy the right crate now.” Crate training works because the crate becomes a positive, safe den. A too-small crate makes it a negative space that dogs resist entering.

Crate Size By Breed: Quick Reference