How to Choose the Right Kennel Size for Your Dog or Cat

Quick Answer

To choose the right kennel size, measure your pet from nose to tail base and from floor to top of head or ears, then add a few inches for comfort. For travel, ensure the kennel meets airline or IATA standards and allows your pet to stand, turn around, and lie down comfortably. Use our size chart and fit guidance below to make the best choice.

Choosing the right kennel size is one of the most important decisions you'll make for your pet's comfort and safety, whether for travel, training, or everyday use. A kennel that's too small can cause anxiety and discomfort, while one that's too large may not provide the secure, cozy feeling pets prefer. This guide will walk you through measuring, sizing, and selecting the best kennel for your dog or cat.

We'll cover the key measurements, provide a size chart, and offer practical tips for travel. We'll also highlight specific products that meet top standards, so you can make an informed choice.

Measure Your Pet Accurately

The first step in choosing the right kennel is measuring your pet correctly. Use a soft tape measure and measure your pet's length from the tip of the nose to the base of the tail (not including the tail itself). Then measure height from the floor to the top of the head (or ears if they stand up). Write these numbers down.

For the kennel, you want enough room for your pet to stand up without crouching, turn around easily, and lie down in a natural position. Add 2 to 4 inches to your height and length measurements to ensure comfort. If you have a puppy, consider their adult size if you want a kennel that will last, but be aware that too much extra space can hinder house training.

• Measure your pet while they are standing in a natural posture.
• Use a flexible tape measure for accuracy.
• If in doubt, size up slightly for comfort, but not so much that it feels cavernous.

Kennel Size Chart for Dogs and Cats

While each pet is unique, these general guidelines can help you start. For dogs, a 24-inch kennel suits small breeds like Chihuahuas, while a 30-inch kennel works for terriers and small spaniels. Medium breeds like beagles may need a 36-inch kennel, and large breeds like Labradors often require a 42-inch or larger. For giant breeds, you may need a 48-inch kennel or custom option.

Cats typically need less space. A small carrier around 20 inches long is fine for most adult cats, but larger breeds like Maine Coons may need a 24-inch or larger. Always check the manufacturer's dimensions and compare them to your pet's measurements. Remember that airline travel has specific requirements, so check with your airline before choosing a travel kennel.

• Measure your pet, not just their weight, as breeds vary.
• For puppies, plan for adult size but use a divider to adjust space as they grow.
• Cats often appreciate a kennel with a top opening for easy access.

Travel Considerations: Airline and IATA Standards

If you plan to travel by air, your kennel must meet airline and IATA regulations. The Petmate Sky Kennel is a popular choice because it complies with the IATA Live Animals Regulation (51st edition, 2025), including door, side, and back ventilation. This means your pet gets proper airflow, which is crucial for stress-free travel. Always check with your airline for specific size and type requirements, as some airlines have their own rules.

For road trips, you have more flexibility, but safety should still be a priority. Ensure the kennel is securely placed in the vehicle and that your pet has enough room to be comfortable. A kennel that's too small can cause motion sickness and anxiety, so follow the sizing guidelines even for car travel.

• Look for IATA-compliant kennels for air travel.
• Ensure the kennel has adequate ventilation on multiple sides.
• Label your kennel with your pet's name and your contact information.

Decision Rules for Choosing the Right Kennel Size

• Measure First: Always measure your pet's length and height before buying. Use these numbers to compare with the kennel's interior dimensions. Never guess; accurate measurements prevent buying the wrong size.
• Consider the Use Case: For travel, prioritize IATA compliance and ventilation. For home use, focus on comfort and easy cleaning. A kennel that's great for air travel might be overkill for a crate at home. Match the kennel to its primary purpose.
• Size Up for Comfort, But Not Too Much: Add a few inches to your pet's measurements for comfort. However, avoid buying an excessively large kennel, as pets may feel insecure and it can hinder house training. Aim for a snug but comfortable fit.

Product Facts and Why They Matter

• Petmate Sky Kennel: Considered the Gold Standard for pet travel, the Petmate Sky Kennel keeps your pet safe and comfortable during car or air travel. This heavy-duty travel kennel is compliant with the standards specified in the 51st edition (2025) of the IATA Live Animals Regulation for live animal transport, including door, side, and back ventilation requirements. It also meets most airline cargo specifications for safe travel. If you fly with your pet, this kennel meets the strictest standards, ensuring your pet's safety and your peace of mind. Its ventilation design also helps reduce stress during travel.
• Petmate 5 lb. Stainless Steel Replendish Feeder: Ideal for indoor or outdoor use, the Petmate Stainless Steel Replendish Feeder utilizes gravity to replenish your pet's food bowl as she eats. Designed to hold up to 5 lbs. of dry pet food, the Stainless Steel Replenish Feeder is perfect for busy pet parents who work long hours, have errands to run after work, or take short weekend trips. For easy cleaning, the bottle has a wide-mouthed opening that makes it easy... When your pet is in a kennel for longer periods, especially during travel, a gravity feeder ensures they have access to food and water without constant refilling. This is a practical addition to your kennel setup.

Fit Guidance: Best For vs. Not For

Best For

• Pet owners who travel frequently by air and need an IATA-compliant kennel.
• Pet parents who want a durable, heavy-duty kennel for both car and air travel.

Not For

• Pet owners who need a budget-friendly option for occasional short trips.

Choosing the right kennel size is about balancing comfort, safety, and practicality. Measure your pet, consider the primary use, and don't forget to check travel regulations. With the right kennel, your pet will be safe and comfortable wherever you go.