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

SKU# 03AM221

  • Cat Mate/Dog Mate 221 suits both large/fluffy cats and small dogs.
  • Four-way locking feature gives control over pet’s access to and from the door.
  • Weather resistant design.
  • Cat Mate frame comes in brown or white.
  • Fits materials 0-2” thick. Suitable for both interior and exterior installations.

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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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  • Cat Mate/Dog Mate 221 suits both large/fluffy cats and small dogs.
  • Four-way locking feature gives control over pet’s access to and from the door.
  • Weather resistant design.
  • Cat Mate frame comes in brown or white.
  • Fits materials 0-2” thick. Suitable for both interior and exterior installations.
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

Designed for both cats and small dogs, the Cat Mate/Dog Mate 221 is a cost-effective solution if you need a door that works for both of your pets! The Cat Mate and Dog Mate models are exactly the same in design and features. The only difference is that the Cat Mate large cat door has the frame color option of white and brown, whereas the Dog Mate only comes in white.  (Note that they are exactly the same specs wise so if you have a dog, but want the brown you can go with the Cat Mate model). With an easy installation and a door that pets can adapt to quickly, you and your pet(s) will thoroughly enjoy your newfound freedoms!

When training your cat and/or dog to use the door, we recommend using treats to encourage and reward them. The strength of the flap magnet might seem a bit intimidating at first, so allow them time to acclimate to the door design.


Features of the Model 221 Pet Doors

  • The versatile, four-way locking tabs take the basic pet door to the next level! It allows more control over your pet’s access to and from the door, which is beneficial if you want to keep them in at night or out during the day! You can set the door to completely locked or unlocked, in only or out only.
  • Made from a durable acrylic frame and lined with brush weather stripping, you won’t have to worry about heat or cold air entering or escaping, especially if you live in an area with temperamental weather. The bottom of the flap includes a magnet that prevents it from constant swinging and keeps the wind from blowing through. Without the need to keep the door propped open any longer, you’ll be saving energy as soon as the door is installed!
  • The clear, acrylic 7x7 flap is easy for pets to see through and is also easy to clean!
  • The large flap accommodates the “fluffiest” of kitties— even those exceeding 20+ pounds! It also supports small dogs up to a shoulder height of 10”.
  • Installs easily in aluminum, metal, and hollow core doors, as well as polycarbonate, plywood, and other thin materials 0-2” thick.
  • Includes a cutting frame for a hassle-free installation.


  • Grants your pets a newfound independence.
  • Your pets will no longer pester you to let them in and out.
  • Prevents active nocturnal cats from interrupting your sleep to eat or use the litter box.
  • For indoor installations, it allows you to put your litter box in a more convenient place to eliminate odors from entering certain parts of the house.
  • Keeps specific food and litter box away from larger pets.
  • Setting the door to completely locked keeps pets safe inside at night, and prevents critters from entering the house.

Customer Reviews

Set Direction
  • 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 Deluxe (4-way lock)
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

Please note that if you intend to install the door into a wall, there is not a cat mate 221 liner to create the tunnel extension. Hiring a contractor or framing out the wall yourself would be required.

Step 1: Place the template in the desired position on the door and trace around it. It is crucial that the frame is level, or else the flap will not swing properly. We also recommend that the bottom of the hole is approximately level with your pet’s stomach for optimal comfort.

Step 2: Use a jig-saw to cut along the inside of the traced line. Be careful to cut the hole square to the door, particularly with thicker doors. Ensure frames are free-fitting in the hole.

Step 3: Determine the thickness of the door panel.

Step 4: If necessary, cut the interior frame (frame without the swinging flap) to correct the length with a sharp knife. Keep your hands clear of the blade and support the inside of moulding with a suitable piece of wood.


For doors and panels 0-⅞” thick:

Step 1: Position interior frame on inside of door and mark four screw positions.

Step 2: Remove frame and drill screw clearance holes in panel to approximately 5mm (3/16”) diameter.

Step 3: Select appropriate screws.

Step 4: Position exterior frame on outside of door. Screw interior to it by using appropriate screw for panel thickness (see Fig. 8a).FInally, fit the screw caps.


For doors and panels ⅞”-2” thick:

Step 1: Drill out four screws in exterior frame to allow close clearance on screws. We recommend a drill 3/16” in diameter).

Step 2: Screw the interior frame on the inside of door, using the short ½” screws.

Step 3: Screw the exterior frame on the outside of the door using the ¾” screws. FInally, fit the screw caps.


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.