The Cat Mate 221 Large Cat Door with insulating weatherstripping and a lockable flap.
white cat mate 221 large cat door
brown catmate 221 cat door
bottom of cat mate 221 large cat door
side view white catmate 221 cat door
cat mate large cat flap box
cat mate brand logo

Cat Mate 221 Large Cat 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 pet's routine
  • Brush strip around the durable polycarbonate flap decreases energy loss

Large Cat Flap Cat Door

The 221 is plastic framed and comes with its own self lining that serves to frame out a hollow core door in a thickness range of 0" - 2". The liner also makes for a neater appearance in a solid core door. It is large enough to accommodate the largest cat.

The translucent flap is a rigid acrylic with weatherproof weather stripping around the perimeter and seals quite well. The Cat Mate Large Cat Flap size incorporates a 4-way locking mechanism.

Important: The Cat Mate 221 "Large Cat Flap" and the Cat Mate 221 "Small Dog Door" are identical products except for the packaging (the part you throw away). Since the Cat version is available in brown and, currently, the Small Dog version is not, purchase the large cat version if you want a brown frame and have a small dog.


  • Versatile, four-way locking system tabs take the basic pet door to the next level. ou can set the lockable door to completely locked or unlocked, in only or out only.
  • Made from a durable acrylic frame and lined with brush weather stripping that works as a weather-proof seal, you won’t have to worry about heat or cold air entering or escaping, especially if you live in an area with temperamental weather.
  • Includes a magnetic closure that prevents it from constant swinging and keeps the wind from blowing through.
  • Clear, acrylic 7x7 flap is easy for pets to see through and easy to clean
  • 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.


  • Prevents active nocturnal cats from interrupting your sleep to eat or use the litter box.
  • For indoor easy 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 cat litter box away from larger pets.
  • Setting the door to completely locked with the cat mate 4 way locking cat flap, it keeps pets safe inside at night, and prevents critters from entering the house.

Size Chart

Flap SizeFlap DimensionRough Cut OutOutside Frame DimensionStock No
Large Cat Door7" w x 7 1/4" h8 3/4" w x 9 3/8" h9 1/4" w x 9 3/4" h03AM221C W
03AM221C B

Colors Available  Brown and White

Replacement Flaps  Replacement Flaps for this Cat Flap may be found at
Cat Mate 221 Large Cat Replacement Flap


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

The flap is clear, but tinted darker.

Can I use a different flap that is clear instead?

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 for pet mate cat mate doors.

Is the flap flexible?

No, the flap is hard plastic.

What is the thickness range for this door?

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

Can I install the 221 in a wall?

It is possible to install the two halves on either side of your wall for an interior cat door, however there is no cat mate 221 wall liner, so you would need to find a diy 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.

Are the magnets removable?

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.

Can I install this in glass?

Yes, thin panels and thinner material like plexiglass can accommodate this door.

Can I lock this door at night?

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

What does a 4-way lock mean?

That means there are 4 locking options: 1) unlocked 2) locked 3) locked going out only 4) locked coming in only

What pet supplies hardware comes with this door?

Short and long screws, and screw hole covers.

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

It can be used on interior or exterior doors.

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

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

Is this considered a good big cat door?

Yes this is a very good, best seller, economical choice if you need a cat flap with a little extra room.

Where can I find a Dog Mate large dog door?

The Dog Mate 215 and 216 are larger pet doors in stock that are 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.

Does the manufacturer make a dog mate large dog door?

They do, those would be the Dog Mate 215 and 216 dog doors.

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

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


To Replace the Flap in a Catmate or Dogmate Pet Door


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.

Installation Instructions

Cat Mate 221 Installation Diagrams

Additional Information

Frame Material


Flap Material


Flap Colors


Flap Thickness


Warranty Period

3 years

Return Period

30 days

Flap Type

Single Flap

Your Maximum Pet Size

Cats, Large Cats

Climate Suitability

Temperate-3 Season

Flap Design

Single, One Part, Rigid, Thin Flap

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, Solid Core Door, Steel Door

Award Winning Design


Sealing Value


Wind Resistance


Self Framing


Replacement Flaps Available


Insulation Value