Published by: Ingrid King. Last Updated on: February 1, 2023 by Crystal Uys

SureFlap Microchip Cat Door

Guest review by Fern Crist, DVM

The SureFlap Microchip Cat Door is a new-to-the U.S. product from the United Kingdom.  It uses RFID technology to read a cat’s veterinarian-inserted microchip and determine whether or not to let the cat inside. This prevents strays, and other animals, from entering a home and adds a high-tech level of convenience to the homes of outdoor cat owners.

SureFlap offered to send one of these doors to Ingrid, and since Allegra and Ruby don’t go outside, but my cats do, she asked me to test and review it for The Conscious Cat.

Let me start out by saying that the Sure-flap Cat Door is a wonderful invention. My favorite feature: it is unlocked by the microchips my cats already have in place.

Our last cat door was unlocked by a magnet hanging on the cat’s collar, a concept doomed from the start. Cats mostly regard collars as irritations, something to be chewed, ripped, or tugged off as soon as possible. End result: a lost collar, a cat stuck outside, and you have to keep buying new magnets.

This door runs on 4 AA batteries, allowing it to recognize the microchip and unlock the latch. The batteries pop into an easy-to-reach chamber on the top of the door. You don’t have to stand on your head to get to the batteries. Well done, engineering team!

The installation procedure was not appreciably different from any cat door. I really like the tube extender, an optional part we needed so that the tube remained unbroken through the full thickness of the wall. All the parts click together easily. The hardest part was cutting the hole in the wall.

Once installed, the door needs to “learn” your cat’s microchip. This is done by the simple method of pushing a button and having your cat walk through the door. Repeat as needed, once for each cat. I was delighted to discover that the door remembers the microchips even if the batteries are dead or missing, removing the need to “re-teach” the door every time the batteries need changing.

After we had our Sure-Flap in place, I taped the flap open for a week so my kitties could get acquainted with the door without unpleasant sensations. Since it is easier for them to push through the flap with the microchip feature turned off, the second step was to leave the flap down but unlocked — batteries out.

The third and final step was the reinsertion of the batteries. To open the door when the microchip reader is active, they do need to squinch themselves up a bit to get the microchip, which is between the shoulderblades, close enough for the door to read.  However, they figured out pretty quickly how to position themselves (this part of the learning process goes faster if you have food on the other side!) and now the mechanics of the door are no problem for them.

I’ve only had one issue with our Sure-Flap: the diameter is a little tight for my larger cat. At a lean 16 pounds, he doesn’t so much walk through the door as ooze through. He looks for all the world like toothpaste coming out of a tube. In future models, I’d suggest that the opening be a little bigger.

While I can’t testify that the door is totally raccoon-proof, I can say that as of this writing, we’ve had several raccoons attempt to get through, so far without success. With our last cat door, a raccoon just needed to insert a claw under the flap and pull, and in he came.  This door seems to be made of sterner stuff.

A warning to consumers: the Sure-flap people sell an adaptor that is supposed to allow you to install the flap in a glass door or glass window, through the glass panes. This only works with single pane, non-safety glass. You cannot install the flap through existing double-pane glass (the manual suggests you purchase a replacement double-pane piece manufactured with a premade opening in it, which may be prohibitively expensive), and safety glass will just disintegrate if you try to cut a hole in it. Be sure you know what kind of glass you have before you buy the adaptor.

Our first Sure-Flap is installed between our kitchen and our sunroom. We plan to install a second one between the sunroom and the deck, creating a double level of security against those pesky raccoons. We had planned to install it in the sunroom glass, but – well – you guessed it.

So we will be installing the Sure-Flap in the aluminum wall of our sunroom. The manual is discouraging about installation in metal walls and doors, since the metal might interfere with the microchip reader. With no other choice, we plan to use the glass adaptor to install the flap through the metal. Worst case, we can turn off the microchip function and leave the outer flap unlocked.  Hopefully I can post the results of this experiment in the future.

Overall, I rate this as an excellent product. Great ease of use, fabulous concept, strong construction. It could be a little bigger, but apart from that, I’m delighted with my Sure-Flap!

For more information about the SureFlap Microchip Cat Door and to purchase, please visit SureFlap’s website.

Dr. Crist has been practicing veterinary medicine since 1982, and has been working exclusively with cats since 1993.  She served on the board of the American Association of Feline Practitioners.  Dr. Crist is married with four children, two of which are not fuzzy.

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10 Comments on Product review: Sureflap Microchip Cat Door

  1. I have Dual Scan Microchip installed but cannot get it to work and don’t understand the manual (the 4-door position is too faint to read).
    I tried the Web site you listed, but it said “private”. So why are you putting it on if we can’t access it?

    • I apologize for the outdated link to the video, Sara. Unfortunately, this sometimes happens with older posts. Please contact SureFlap through their website – they have a wide variety of support options available:

    • Hi Leanna,

      I have not put it through an aluminum wall, at least not yet, so I can’t comment. Anyone else?

  2. Dr. Crist,
    You mentioned the size of the door. I have 2 cats and 2 medium to larger size dogs… If I got a large or even a medium door will the cats have an issue using it as you mentioned about the microchip reader.


    • Hi Weatherfox,

      I just measure the “hole dimensions” of the Sureflap door I have. At approximately 5.5 inches square, it’s a full inch smaller both vertically and horizontally than the product current being shown on the Sureflap website. I’m hoping they took a cue from the post I wrote above!

      The current Sureflap cat door product hole is shown to be about 6.5″ square. I think even my big kitty would have an easy time with that. However, with dogs in the mix, I would consider their second product, the Pet Door, which advertises “Opening measurement of 7″ (w) x 6.69″ (h).” Of course I have no personal experience with either product they are now selling, but if they have held to the standards of the earlier door, I’d say you’d be happy with it.

      Cheers and warm wishes,

      Fern Crist, DVM

  3. Hi Laurel,

    My experience with raccoons and the Sureflap door has been excellent to date. So far, no raccoons have made it inside, at least not at my house.

    I have had raccoons defeat other doors, which makes me doubly happy that it hasn’t happened yet with this one. LOTS of destruction!

    That being said, raccoons are extremely intelligent, very strong, and larger than most people think — my guess is that there is no door that a determined raccoon could not eventually defeat.

    I avoid putting food near the door when raccoons might be around (read: night), and I keep the outdoor area near the door clear of trash, debris or anything they might consider attractive. I also have exterior motion detector lights that scare them off — so I’m not sure how much of a challenge they actually post to the door at my house. I think the best approach is using all these tactics and not to put all your proverbial eggs in one allegorical basket!

    Cheers and warm wishes,

    Fern Crist, DVM

    • Dr. Crist, thank you for that information. I will give the door a try, and wait to order the new, larger one that will come out in early 2013.

  4. Dr. Christ, what has been your experience with raccoons getting through the Sureflap microchip cat door? I have read reveiws that say the raccoons can get their nails under the flap and pull it open. As that is one of the intruders that I seriously want to stop entry, this is important to me.

    Thank you!

    • This door is not raccoon proof…they pull and get their little claws around the door and pull it outward, even when it is locked both ways…and get in…but maybe my raccoons are extremely smart.

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