36 inch versus 42 inch dog crate

A 36-inch dog crate is usually the better choice for a medium-to-large dog that can stand, turn around, lie down, and stretch comfortably inside. A 42-inch crate provides more length and height for larger, taller, or long-bodied dogs—but extra space is not automatically better, especially for puppies still learning to settle or dogs that may use one end as a bathroom.

The right choice depends on your dog’s actual measurements, sleeping position, crate-training stage, and where the crate will sit in your home.

36-inch versus 42-inch dog crate at a glance

Dimensions vary by manufacturer, so “36-inch” and “42-inch” are crate-length categories rather than guaranteed interior measurements. Always check the product’s usable inside length, width, and height—not only its outside dimensions.

Choose based on your dog's measurements

Measure your dog while standing naturally. You will usually need three measurements:

1. Length: Measure from the tip of the nose to the base of the tail, then add room for comfortable positioning. Do not measure to the end of the tail.
2. Height: Measure from the floor to the top of the head or the highest point of the ears, depending on which is higher when your dog is standing naturally.
3. Width: Consider the dog’s widest point, including the shoulders and any thick coat.

Your dog should be able to:

• Stand without crouching or rubbing the crate roof
• Turn around without squeezing
• Lie down fully on their side
• Stretch and change positions comfortably
• Enter and exit without ducking excessively

If your dog is between sizes, compare the actual interior dimensions and consider the dog’s body shape. A short, stocky dog may need more width, while a tall or long-bodied dog may need the additional length and height of a 42-inch crate.

When a 36-inch crate makes more sense

Choose a 36-inch crate when it gives your dog adequate standing height and sleeping length without leaving a large amount of unused space. It is often a practical fit for dogs that are large but not especially tall or long.

A 36-inch crate may also be preferable when:

• The crate must fit in a bedroom, office, or smaller living area
• You frequently move the crate between rooms
• Your dog prefers a more enclosed, den-like space
• You want a crate that is easier to transport or store
• Your dog is already near adult size and does not need much growth room

Check the interior after adding a crate pad. A thick pad can reduce usable height and floor space, particularly in crates with a low roof or sloped sides.

When a 42-inch crate makes more sense

A 42-inch crate is worth considering when a 36-inch model would leave little room above your dog’s head or would force the dog to curl up rather than stretch out. It can be a better fit for taller, longer, or larger-framed dogs.

The larger crate may also help if your dog:

• Sleeps fully stretched out
• Changes positions frequently at night
• Has a long back or tall shoulders
• Has a heavy coat that reduces the practical space inside
• Needs room for a water container or other permitted accessory

A 42-inch crate is not the right choice simply because your dog is labeled a “large breed.” Breed labels are rough guides. Two dogs of the same breed can require different crate sizes based on sex, build, age, and body length.

Puppy growth: use a divider when possible

For a puppy that will grow into a large adult, a crate with an adjustable divider can prevent the crate from becoming oversized during house-training. Set the divider so the puppy has enough room to stand, turn, lie down, and stretch—but not a large unused section.

Move the divider as the puppy grows. Once the dog needs more room, adjust it gradually rather than buying a second crate solely because the puppy has outgrown the initial section.

A divider is only useful if it is designed for that crate and remains securely attached. Do not use a loose panel, improvised barrier, or accessory that could fall over or create gaps where a dog could become trapped.

Consider the crate's location and construction

The difference between 36 and 42 inches is not only about the dog. Measure the intended location before buying.

Check for:

• Doorways and stair turns
• Available floor width and depth
• Clearance for opening the crate door
• Space around the crate for cleaning
• Whether the crate must be folded or moved regularly
• The location of vents, radiators, or direct sunlight

A 42-inch wire crate may have a substantially larger footprint than its nominal length suggests. A furniture-style or plastic crate may have different interior dimensions and ventilation, so compare usable space rather than assuming all crate types of the same listed length fit the same way.

The door location also matters. A crate that fits the wall but cannot open fully may be impractical. For a dog that enters hesitantly, a wider front opening or a second door may be more useful than a longer crate.

Is a bigger dog crate better?

Not always. The crate should be large enough for normal movement but not so oversized that it becomes difficult for the dog to settle or maintain a clean sleeping area. Some dogs benefit from extra room, while others relax better in a closer, more enclosed space.

Extra space is particularly important to evaluate during puppy house-training. A puppy with access to a large unused area may be more likely to sleep in one section and eliminate in another. A correctly fitted divider can solve this without limiting the dog once it is fully grown.

For an adult dog that is reliably house-trained, additional room is usually less of a concern as long as the crate remains comfortable, secure, and easy to clean.

Which size should you choose?

Choose the 36-inch crate if your dog fits comfortably within its interior measurements, the crate needs to fit a tighter space, or portability matters.

Choose the 42-inch crate if your dog is tall, long-bodied, still growing toward a large adult size, or cannot stand and stretch comfortably in a 36-inch model.

If the dog is still a puppy, prioritize a crate with a compatible divider. If your dog is between sizes, prioritize standing height and sleeping length first, then confirm that the crate will fit the intended room and door path.

When neither size works comfortably, move up or down based on the measurements rather than forcing the dog into a nominal size category. A slightly larger crate with a secure divider is generally more useful for a growing dog than a crate that will be outgrown quickly.