Replacement Flap For Chubby Kat/Hefty Kat - Door

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Large Size Chubby Kat 7-1/2" X 10-1/2" FLAP Has Solid LEXAN™ Plastic Flap/Plastic Frame. Also Fits Hefty Kat and Medium Pet Flap Models.

How to measure your Ideal Pet

To determine the correct size door, simply measure the width (A) and height (B) of your pet.

(A) Measure the widest point of your pet's shoulder.

(B) Measure from the top of your pet's back (just behind their head) to the bottom of chest.

Pet door models have different size openings. Just make sure your new pet door's opening is both wider and taller than your pet's measurements to ensure they can comfortably pass through.

  • 5
    Perfect fit

    Posted by DeeAnn on 27th Dec 2017

    Got a new flap because our cats ripped the fringe off the old flap. (NO fault of the manufacturer ) Didn't come with instructions on how to replace, but YouTube had a great video that helped us out. The new flap is installed and working great.

  • 5
    Replacing door.

    Posted by Unknown on 8th Dec 2017

    Great quality and easy instructions.

  • 5
    Perfect Fit

    Posted by Norman Fagan on 2nd Nov 2017

    This part wasn't listed in your product line up, because it's an old door. I listed the size needed and you supplied it. Perfect fit. Couldn't be happier.

  • 2
    Letting out all the heat!

    Posted by Rene on 30th Nov 2016

    I replaced the flap because my cats had pulled off the fringe and the door wouldn't close all the way on a consistent basis. New fringe and still no consistent closure on it's own. I have to get up and tap it with my foot nearly every time. So frustrated. All of our products are warranted against manufacturing defects. Please call us toll free at 1-800-378-4385 Monday – Friday 8AM – 4PM PST (excluding holidays) or email us at: and allow us to resolve the issue.

  • 5
    Ideal pet products # 1

    Posted by Mark M. on 8th Aug 2016

    This company is amazing! Great products and the service and shipping are awesome.

  • 5
    Good as new

    Posted by Lorraine Railey on 8th Jul 2016

    The replacement pet door shipped quickly. It arrived in just a few days. It was easy to remove the old one and put the new one in. I have been so impressed with the quality of the Ideal pet window and to be able to replace a part, rather than buy a whole new unit, is so wonderful. This window/door is one of the best things I've ever purchased.

  • 5
    easy to install

    Posted by Unknown on 10th May 2016

    Found a video on your website as to installing replacement door. It made it simple. Completed in 1O minutes. Thanks.

  • 4
    Exactly what I needed

    Posted by Unknown on 20th Apr 2016

    My original flap for my cat door was damaged. Being able to buy a replacement meant I can use the door exactly as it was intended. Although the replacement cost nearly as much as the whole door, I am glad to have it working and looking as it should. Thank you

  • 5
    perfect replacement part

    Posted by Unknown on 12th Jan 2016

    Easy replacement door. So excited this exists. Have had the hefty cat window "door" for several years and it was in rough shape. Perfect replacement.