Cat Mate 221 Large Cat Door
- 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
- 4-way lock using sliding tabs securely lock the flap so you can control your pet's routine
- Brush strip around the durable, clear, rigid, Polypropylene flap decreases energy loss

Product Details
The Cat Mate 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 clear flap is a rigid Polypropylene with weatherstripping around the perimeter. The Cat Mate Large Cat Flap size incorporates a 4-way locking mechanism: maunally set to Locked, Unlocked, In Only, or Out Only as needed.
Please Note: 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.
Not the indoor cat door you're looking for? Check out our full selection of cat doors for doors and small dog flaps.
Features:
- Versatile, four-way locking system (fully locked, unlocked, in-only or out-only) takes the basic pet door to the next level
- Made with a durable plastic frame and lined with brush weatherstripping for a weather-proof seal
- Magnetic closure prevents the flap from constantly swinging open and keeps the wind from blowing through
- Clear, Polypropylene 7" x 7" 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 14”
- Installs easily in aluminum, metal, and hollow core doors, as well as polycarbonate, plywood, and other thin materials 0"– 2" thick
Benefits:
- 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
- 4-Way lock allows you to control your pet's entry and exit
Size Chart
- Cat Mate 221 Large Cat Door7"w x 7 1/4"h
Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Size | Flap Dimension | Rough Cut Out | Outside Frame Dimension | Recommended Pet Height |
---|---|---|---|---|
Large Cat Door | 7" w x 7 1/4" h | 8" w x 8 3/4" h | 9-1/4" w x 10" h | 5" - 10" |
Not sure if this is the correct flap size? Here is a measurement guide to help you out.
Find The Best Pet Door Size For My Pet

A
Pet Height: inches
B
Pet Width: inches
Installation Instructions

Parts
- Cat Mate 221 Pet Door
- Installation Template
- Screws
Tools
- Electric Jigsaw
- Drill
Please read instructions & notes thoroughly before installation.
Step 1 Mark the Outline

- Place template in desired position on door and draw round it.
- We recommend the bottom of the hole is approximately level with your pet’s stomach.
Step 2 Make the Cutout

- Use an electric jig-saw to cut along inside of drawn line.
- Ensure frames are free-fitting in hole.
Step 3 Door Thickness

- Determine thickness of door panel (t).
Step 4 Adjust the Frame

- If necessary, cut interior frame (frame without swinging flap) to correct length with sharp knife.
Step 5: For door panels 0 - 7/8" thick Position the Frame



- Position interior frame on inside of door and mark four screw positions.
Step 6 Drill Holes



- Remove frame and drill screw clearance holes in panel to approximately 3/16 inch diameter.
Step 7 Select Screws



- Select appropriate screws.
Step 8 Position the Outside Frame

- Position exterior frame on outside of door. Screw interior frame to it by using appropriate screw for panel thickness (t) (see Fig. 8).
- Finally, fit screw caps.
Step 9: For door panels 7/8" or more thick Drill the Holes

- Drill out four screw holes in exterior frame to allow close clearance on screws.
- (Recommended drill 3/16 inch diameter).
Step 10 Attach Interior Frame

- Screw interior frame on inside of door, using short 1/2 inch screws.
Step 11 Attach Exterior Frame

- Screw exterior frame on outside of door using 3/4 inch screws. Finally, fit screw caps.
Videos
To Replace the Flap in a Catmate or Dogmate Pet Door
FAQ
Where can I find 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. |
How much does shipping cost? Shipping is calculated at checkout. |
Warranty
Cat Mate/ Dog Mate/ Ani Mate 3 Year Limited Warranty
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 manufacturer’s 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.
Customer Reviews

Size Chart
- Cat Mate 221 Large Cat Door7"w x 7 1/4"h
Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Dimensions:
7"w x 7 1/4"h
The entry way your dog goes through.Outside Frame Dimensions
9 1/4"w x 10"h
The outer edge of the pet door.


Rough Cut Out:
85/8"w x 10"h
The size of the hole needed to fit your pet door into your door.Flap Size | Flap Dimension | Rough Cut Out | Outside Frame Dimension | Recommended Pet Height |
---|---|---|---|---|
Large Cat Door | 7" w x 7 1/4" h | 8" w x 8 3/4" h | 9-1/4" w x 10" h | 5" - 10" |
Not sure if this is the correct flap size? Here is a measurement guide to help you out.
Find The Best Pet Door Size For My Pet

A
Pet Height: inches
B
Pet Width: inches
Installation Instructions

Parts
- Cat Mate 221 Pet Door
- Installation Template
- Screws
Tools
- Electric Jigsaw
- Drill
Please read instructions & notes thoroughly before installation.
Step 1 Mark the Outline

- Place template in desired position on door and draw round it.
- We recommend the bottom of the hole is approximately level with your pet’s stomach.
Step 2 Make the Cutout

- Use an electric jig-saw to cut along inside of drawn line.
- Ensure frames are free-fitting in hole.
Step 3 Door Thickness

- Determine thickness of door panel (t).
Step 4 Adjust the Frame

- If necessary, cut interior frame (frame without swinging flap) to correct length with sharp knife.
Step 5: For door panels 0 - 7/8" thick Position the Frame



- Position interior frame on inside of door and mark four screw positions.
Step 6 Drill Holes



- Remove frame and drill screw clearance holes in panel to approximately 3/16 inch diameter.
Step 7 Select Screws



- Select appropriate screws.
Step 8 Position the Outside Frame

- Position exterior frame on outside of door. Screw interior frame to it by using appropriate screw for panel thickness (t) (see Fig. 8).
- Finally, fit screw caps.
Step 9: For door panels 7/8" or more thick Drill the Holes

- Drill out four screw holes in exterior frame to allow close clearance on screws.
- (Recommended drill 3/16 inch diameter).
Step 10 Attach Interior Frame

- Screw interior frame on inside of door, using short 1/2 inch screws.
Step 11 Attach Exterior Frame

- Screw exterior frame on outside of door using 3/4 inch screws. Finally, fit screw caps.
Videos
To Replace the Flap in a Catmate or Dogmate Pet Door
FAQ
Where can I find 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. |
How much does shipping cost? Shipping is calculated at checkout. |
Warranty
Cat Mate/ Dog Mate/ Ani Mate 3 Year Limited Warranty
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 manufacturer’s 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.
- Reviews
- Questions

Loved the cat door
My cat likes it too!
Worked Well
The Cat door was easy install and has worked well. Our cat is about 14lbs so the large door worked best for him. He was slow to want to go through it but a few treats a couple of days in a row and now he is a pro.
Great Product
Received product quickly. My husband installed it in our garage door without any problem and the cats starting using it immediately. We have eight outside cats that sleep and eat in our garage, so the door is getting a lot of use and so far so good.
works great
Have 3 cats that use the door all the time. Would have given it 5 stars but occassionaly door doesn't swing all the way shut and I get a cold draft.
Nice door
Installed this door in a 2" thick panel of our patio enclosure. Template was exact, instructions clear but no 2 1/2" screws were included that are required when installing in a 2" panel. Fortunately Lowe's had brass screws.