Dog Door Size Guide: Choosing the Right Fit for Your Furry Friend

When it comes to installing a dog door, size matters more than you might think. A door that's too small can be uncomfortable or even unusable, while one that's too large can lead to heat loss and security issues. Here's a simple guide to help you choose the perfect dog door size for your pet.

Why the Right Size Matters

• Comfort and confidence for your dog when entering or exiting
• Better insulation and security
• Easier training and less hesitation

Dogs come in all shapes and sizes, so it’s important to consider more than just weight or breed.

How to Measure Your Dog

1. Height: Measure from the floor to the top of your dog's shoulders (withers).
2. Width: Measure across the widest part of your dog (usually the chest or hips).
3. Step-over height: Height from the ground to the bottom of the door. It should be low enough for your dog to step through comfortably but high enough to keep out dirt and drafts.

✅ Tip: Add 2–3 cm to both height and width for a comfortable fit.

General Size Guidelines (by Dog Size)

Always double-check your individual dog’s measurements!

Other Things to Consider

• Double flap vs. single flap: Double flaps improve insulation
• Locking mechanisms: Consider 4-way locks or electronic control
• Wall vs. door installation: Some doors offer tunnel kits for walls
• Microchip or RFID doors: Ideal for households with cats and dogs

Final Thoughts

Getting the size right from the start makes all the difference in comfort, safety, and convenience. If in doubt, go slightly larger — especially for puppies who are still growing.

Browse our full range of dog doors at catflaps.co.uk — we’re here to help with measuring tips, product support, and the perfect fit for every pup.