What Size Pet Door Do You Need? Easy Sizing Guide

Pet door size guide for dogs and cats - find the right fit for your pet

Pet Door Products makes choosing the right pet door size simple. Whether you have a tiny tabby or a large Labrador, our guide ensures a secure, energy-efficient fit that works seamlessly with your sliding glass door.

Pet Door Size Chart

Pet Door Size	Pet Height Range	Recommended For
Small	Up to 12″	Cats, Chihuahuas, Yorkies, Shih Tzus
Medium	13″ – 17″	Cocker Spaniels, Beagles, Terriers
Large	18″ – 22″	Labradors, Boxers, Border Collies
Extra-Large	23″ – 28″	Golden Retrievers, German Shepherds

Need help choosing? Request a quote and we’ll guide you through it.

Why Ignoring Your Pet Door Needs Costs More Than You Think

Why Pet Door Size Matters

Choosing the wrong size can lead to:

Discomfort for your pet when using the door
Increased wear and tear on the frame and flap
Reduced energy efficiency
Difficulty with locking or sealing the door

A properly sized pet door = safer pets, lower bills, and a better fit for your lifestyle.

Learn more about the pros and cons of installing a dog door.

How to Measure Your Pet

Small Dog & Cat DoorsUse these quick steps to get the perfect fit:

Add 1–2 inches to both height and width for comfortable clearance.
Height – Measure from the ground to the top of your pet’s shoulders (withers).
Width – Measure the widest part of your pet (typically the chest or hips).

Pro Tip: Use treats to get your pet to stand still while you measure!

For a full visual guide, check our complete measurement guide.

Designed to Fit — Engineered to Last

Our sliding glass pet doors are:

Comparison of different pet door sizes for dogs and cats

Secure – Locking panel included to prevent unwanted entry
Energy-Efficient – Weather-sealed flaps and insulated glass
Custom-Built – We manufacture your full door replacement, not an insert

See how our pet doors compare to traditional inserts.

Visual Sizing Guide

Embed your Canva visuals here (based on your provided links) — ideally as a slider or expandable image gallery for:

Side-by-side pet sizing examples
Real pet use in small, medium, large doors
How our doors look once installed

You can also explore cat-friendly pet doors if you have feline companions.

What Our Customers Are Saying

Kaylie Shaw

May 31, 2024

Patrick was awesome! He was super helpful and detailed with the whole process.

Levi Peterson

May 31, 2024

Great product and great experience through the whole process! Patrick really helped us find the right fit for our dog.

Scott Eliot

May 31, 2024

We had a great experience working with Patrick. He gave us a fair quote and the install was quick. Our dog Charlie loves being able to come in and out as he needs. When I get a bigger house with more doors I’ll be sure to reach back out to Pat and the Pet Door team.

Mandi Jones

May 26, 2024

We love our pet door. It’s a clean and professional look. Highly recommend.

Angela Sachs

May 24, 2024

Pet Door Products have been wonderful to work with. They are quick and reliable! I was a bit worried about my VERY LARGE lab fitting through the door but it’s perfect and both of my dogs picked up on it so quickly. I also love that the magnet that keeps the flap closed is strong enough to stay closed during wind storms. Can’t say enough about this product and how much my dogs and my family are enjoying this.

Stacy Basham

April 29, 2024

Excellent service, great install and very high quality product. Very impressed with the durability and structure of the product. Would recommend to family and friends.

Adam Lay

April 29, 2024

Great experience overall with Pet Door Products. They came out quickly to get me a quote, and once the glass was in stock they came out promptly to install it. The end result is beautiful, my dog loves the ability to go out on his own and I love that I can lock my sliding door again!

Holly Smith

April 29, 2024

We’ve been needing a dog door for awhile. Pet Door products made getting a door super easy. Everyone was so nice. The install was fast and the door arrived before expected. We tried another company before Pet Door Products and we did not have a good experience. Nobody followed up and they didn’t come back when they were suppose to. But Pet door products was the exact opposite. Fast, friendly, professional and a great product. My dog is enjoying the door and I am glad I don’t have to get up anymore to let her out. Win win for all! Holly Smith

Reilly Kelly-bloxham

April 29, 2024

Pat was great to work with and explained how everything would get installed. Pricing was extremely fair and the install only took about 35 min. 10/10 recommend if you’re on the fence about getting one.

Frequently Asked Questions

When selecting a pet door for a growing puppy, it’s best to base your measurement on their estimated full-grown size — not their current height and width. Consult your vet or breed-specific growth charts for guidance. Choosing a door that matches their adult size ensures long-term comfort, usability, and avoids needing a costly upgrade later. A door that’s too small can be difficult to use and cause anxiety or injury.

For extra peace of mind, our team can help you choose the ideal size — just request a quote and mention your pet’s age and breed.

We recommend choosing a door size that fits your largest pet comfortably. Smaller pets typically adapt quickly and learn to navigate slightly larger doors with ease. For example, a medium-sized dog door might be perfect for a lab and still workable for your smaller terrier.

If your pets are extremely different in size (e.g., a large dog and a very small cat), we’re happy to recommend a balanced solution — or even dual-door setups depending on your needs. Our guide to pet doors for multi-pet homes offers more insight.

Not with Pet Door Products. All of our doors — regardless of size — are designed with energy efficiency in mind. Larger doors feature the same weather-sealed flaps, tight magnetic closures, and insulated glass as our smaller models.

Our built-in systems eliminate the gaps and drafts commonly found in cheaper panel inserts. If you’re concerned about energy costs, check out our article on energy-efficient dog doors to see how we help homeowners across Utah maintain a comfortable indoor climate year-round.

Want help? Visit our FAQ page for more answers.

Ready to Give Your Pet the Freedom They Deserve?

We proudly serve pet owners across Salt Lake City, Ogden, Provo, and throughout Utah with professional-grade, sliding glass pet doors designed for comfort, security, and style.

Call (801) 973-8000 or Get a Free Quote to start sizing your perfect pet door today!

Get Your Free Estimate Today