Dog Mate / Cat Mate 221 Small Dog & Large Cat Door

SKU# 03AM221

  • The most recommended large cat/small dog door
  • Fits materials 0" - 2" in thickness, great for storm doors and interior/exterior installs
  • Generous 7" x 7" flap is suitable for even the biggest cats
  • Sliding tabs securely lock the flap so you can control your pets routine
  • Brush strip around the durable polycarbonate flap decreases energy loss

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Stock No: 03AM221

Availability: In stock

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Dog Mate / Cat Mate 221 Small Dog & Large Cat Door
Dog Mate 221 door

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  • The most recommended large cat/small dog door
  • Fits materials 0" - 2" in thickness, great for storm doors and interior/exterior installs
  • Generous 7" x 7" flap is suitable for even the biggest cats
  • Sliding tabs securely lock the flap so you can control your pets routine
  • Brush strip around the durable polycarbonate flap decreases energy loss
Flap SizeFlap DimensionRough Cut OutOutside Frame DimensionStock No
Large Cat Door7" w x 7" h8 3/4" w x 8 7/8" h9 1/4" w x 9 3/4" h

03AM221C W
03AM221C B

Small Dog Door7" w x 7" h8 3/4" w x 8 7/8" h9 1/4" w x 9 3/4" h

03AM221D W

Replacement Flaps  Replacement Flaps for the 221 models may be found at

Cat Mate 221 Large Cat/Small Dog Replacement Flap

Cat-Mate/Dog-Mate 221 Pet Doors

The most recommended choice for a simple large cat/small dog installation. The 221 will frame out to fit hollow or solid core doors from 0” - 2” in thickness making it great for multiple installation types.

Features of the Model 221 Pet Doors

  • Bigger flap fits large cats and small dogs.
  • Broad self-framing range is perfect for almost any installation.
  • Has a very durable acrylic frame surrounded by a brush weather stripping for added weatherproofing.
  • Incorporates a 4-way locking feature.
  • The Cat version is available in brown and the Small Dog version is not, purchase the large cat version if you want a brown frame and have a small dog.
  • These doors are identical, the only difference is the Dog version has a picture of a dog on the package, where the Cat version has a cat.
  • 3 year warranty.

Perfect Time for the 221 Pet Doors

  • Simple and durable large cat door can be used for a wide variety of installations.  (Note there is not a cat mate 221 liner for wall installations so that would require framing out the wall yourself or having a contractor help you out).
  • Thinner materials like storm doors or plexiglas will be able to have a 221 pet door installed since it can frame down to 0.
  • Good quality door for an interior installation.

Customer Reviews

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  • great product for the price review by court
    5 5 great product for the price

    This door is exactly what I expected for the price. I live in California so I did not need an energy efficient door I just wanted something to let the cat in and out. I love the locking feature on it. I can set it to where my cat can only come in not go out, go out not come in, go in, go out. It also fits on materials from 0 to 2 inches which is great because it works perfect for the small separator I have. I recommend this door !!

    (Posted on 6/27/2018)

  • Catmate 221 flap doesn't shut properly review by frustrated
    5 1 Catmate 221 flap doesn't shut properly

    This is my second CatMate 221 . I have had a problem with the flap not closing properly with both. It stays open about an inch about 50% of the time. I replaced the first one after it started staying open, and the replacement is doing the same thing. The company will not replace the door. I am supposed to send it back in for repairs. I kind of understand that but…it’s snowing today, again. Definitely not a good idea to have a gaping hole in my door to the outside.

    Ed Note:
    With doors that have rigid flaps- if the hole is too tight, not perfectly square, or the screws have been over-tightened it can cause pressure on the framing making it tweak slightly. This slight amount of tweaking to the frame will make it so that the flap can't properly pivot on the rods causing the issue you are experiencing.

    I would suggest first loosening the screws that hold the pet door just slightly. It that doesn't help then double check the dimension of the hole you have to make sure it is square and possibly enlarging it just slightly.

    (Posted on 1/24/2018)

  • Good for fat cats! review by Alexis
    5 5 Good for fat cats!

    I got the smaller version of this door but my fat cat wasn't able to use it comfortably so he never really used it. I switched over to this cat door and it is much better! Gives him a bit more wiggle room so he can get his exercise.

    (Posted on 1/11/2018)

  • Good for Small Pets review by Fester
    5 4 Good for Small Pets

    This a good door for both my smallish dog and chubby cat who are best friends. It was easy to install and I like the four locking choices.

    (Posted on 12/28/2017)

  • Fat cat review by Peggy
    5 5 Fat cat

    Have a cat that is a little on the chubby side and this worked much better for him. It was slightly larger than other doors, but not huge.

    (Posted on 12/22/2017)

  • Nice door review by Richard
    5 4 Nice door

    Installed it in an interior door and works well. Took my dog some time to learn how to get through, but nothing some treats and coaxing can't fix. The only thing is that since it has a hard flap, there is a louder slap after my dog goes through compared to other doors with flexible flaps.

    (Posted on 12/5/2017)

  • Good for the cost review by Zoie
    5 4 Good for the cost

    Cats get used to it petty quickly, but when you want to close it off the tabs can be a little difficult to slide over. The size is perfect for the one's on the bigger size too and it's hard to find a cat door that fits that bill without going way too big.

    (Posted on 10/11/2016)

Weight 2.0000
Manufacturer Cat Mate / Dog Mate
Your Maximum Pet Size Cats, Large Cats, Small Dogs
Climate Suitability Temperate-3 Season
Wind Resistance Average
Sealing Value Average
Self-Framing Yes
Frame Material Plastic
Insulation Value Low
Flap Material Acrylic
Flap Design Single, One Part , Rigid, Thin Flap
Flap Colors Clear
Flap Thickness 1/8"
Replacement Flaps Available Yes
Ability to Lock Flap Built-In 4-Way Locking
Can Be Installed In Aluminum Door, Hollow Core Door, Metal Door, Polycarbonate, Plywood or Other Thin Material
Warranty Period 3 years
Return Period 30 days
Manufacturer's Restocking Fee none

Cat Mate Cat Door



To Replace the Flap in a Catmate or Dogmate Pet Door

Cat Mate/ Dog Mate 221 Installation Diagrams


Q: Is the flap on the cat mate 221 large cat door clear?

A: The flap is clear, but tinted darker.


Q: Can I use a different flap that is clear instead?

A: Flaps usually are not interchangeable between models as they attach to the door differently, so the flap that comes with the door is the only option that is compatible


Q: Is the flap flexible?

A: No, the flap is hard plastic.


Q: What is the thickness range for this door?

A: This door fits materials 0-2"" thick and is great for storm doors and interior/exterior doors.


Q: Can I install the 221w in a wall?

A: It is possible to install the two halves on either side of your wall, however there is no cat mate 221 liner, so you would need to find a way to build a tunnel and attach the frames, making sure to caulk the edges to prevent water leaking into the wall. The Cat Mate 234/235 is a similar smaller product that can be installed in walls.


Q: Are the magnets removable?

A: No, they are not. If your cat is having issues pushing through, you can put some tape over the magnets on the frame to lessen the attraction.


Q: Can I install this in glass?

A: Yes, thinner materials like plexiglass can accommodate this door.


Q: Can I lock this door at night?

A: Yes, there is a built in 4-way locking feature


Q: What does a 4-way lock mean?

A: That means there are 4 locking options:

1) unlocked

2) locked

3) locked going out only

4) locked coming in only


Q: What hardware comes with this door?

A: Short and long screws, and screw hole covers.


Q: Is the cat mate large cat door good for interior installation?

A: It can be used on interior or exterior doors.


Q: Is the cat mate large cat flap door the same as the chubby kat door?

A: It is not the same, they are just both for larger pets.


Q: is this considered a good big cat door?

A: Yes this is a very good economical choice if you need a cat flap with a little extra room.


Q: Where can I find a Dog Mate large dog door?

A: The Dog Mate 215 and 216 are larger pet doors available in two sizes. The flap size for the 215 is 8 3/4" w x 10 1/4" h and the 216 is 11 3/4" w x 14 1/8" h.


Q: Does the manufacturer make a dog mate large dog door?

A: They do, that would be the 216 and that can be purchased by clicking here.


Q: I bought a Model # 221WD in the past. Is this the same pet door?

A: Yes it is. It is the Small Dog Door with a flap size of 7"w x 7"h.


Q: Can a dog use the cat mate large cat door?

A: Yes! They are actually the exact same product, just in different packaging.

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Cat Mate / Dog Mate Warranty

Cat Mate / Dog Mate / Ani Mate
guarantees your purchase for a period of three years from the date of original purchase against any defect arising due to faulty materials or manufacture. Accordingly any defective item will be repaired free of charge or replaced at the manufacturers option provided that the defect has not been caused by neglect, misuse or normal wear and tear and proof of purchase date is supplied.  Your statutory rights are not affected.