Replacing a Kennel Door: Sizing Guide for 21" and 24" Models

By Petmate | Published: 2026-10-31

Category: How-to Guides

Learn how to replace a plastic kennel door by measuring your kennel and matching it to a 21" or 24" model. Includes when to stop and choose another option.

Quick answer

To replace a broken plastic kennel door, first measure your kennel's exterior length from the front door opening to the back. Then match that measurement to the correct replacement door size: 21" or 24". Order the door designed for your specific kennel model to ensure proper fit.

Why measuring the kennel, not the old door, is critical

Replacement doors are sized by the kennel's overall length, not by the door's dimensions alone. A door that looks similar may not latch securely if it's meant for a different kennel size. Always measure the kennel from the front door opening to the very back of the plastic shell. This measurement determines whether you need a 21-inch or 24-inch replacement door.

When a door doesn't meet airline requirements

Some replacement doors are not IATA-compliant and should not be used for air travel. If you plan to fly with your pet, check the product description carefully. The 21" Ultra Vari Kennel Replacement Door, for example, fits the 21" Sky Kennel but does not meet IATA requirements. For airline travel, you may need a different door or a kennel that is already approved.

Diagnose your kennel door problem

Symptom: Door is cracked or broken: If the plastic door is cracked, has broken hinges, or the latch no longer holds, replacement is usually necessary. Measure your kennel's exterior length from front to back to determine if it's a 21" or 24" model. Order the replacement door designed for your exact kennel size and model.
Symptom: Door is difficult to open or close: Sometimes the issue is misalignment or debris in the tracks. Clean the door tracks and check for bent pins. If the door is otherwise intact, you may not need a replacement. Try cleaning and aligning first; if the problem persists, consider replacement.
Symptom: Door missing or lost: If the door is completely missing, you'll need a full replacement door assembly. Measure your kennel as above and choose the correct size. Ensure the replacement includes the door and necessary hardware. Verify that the replacement includes all parts needed for installation.
When to stop and choose another option: If your kennel is not a standard 21" or 24" size, or if the replacement door does not latch securely after installation, stop. Contact the manufacturer or consider a new kennel. Also, if you need an IATA-compliant door for travel, the 21" Ultra Vari door is not suitable; explore airline-approved kennels instead. Do not force a door that doesn't fit; safety and security are paramount.

Replacement door options

21" Ultra Vari Kennel Replacement Door: This replacement door is specifically for the Petmate 21" Ultra Vari Kennel and measures 9 3/8" long by 10 3/4" tall. It ensures a precise fit for that kennel model, but it does not meet IATA requirements for airline travel.
21" Ultra Vari Kennel Replacement Door
Black Replacement Door for 24" Plastic Kennels: This black replacement door fits 24" plastic kennels from various brands, including Aspen Pet Fashion Pet Porter and Petmate Two Door Top Load Kennel, and measures 9 7/8" long by 12 1/4" tall. It offers a compatible option for multiple 24" kennel models, simplifying replacement.
Black Replacement Door for 24" Plastic Kennels