A cat flap in action.A wall-mounted flap with access tunnel.

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Cat Doors & Flaps

A cat flap (also known as a doggie door or pet door) is a hinged flap set into a door, wall or window to allow cats, dogs, or other domestic pets to enter and exit a house on their own without needing a human to open the door. more...

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They are very popular with cat owners, many of whom like to encourage their cats' natural independence by letting them come and go at will — particularly in the United Kingdom where it is believed that about 90% of all cats (including ferals) have access to the outdoors, many of these via cat flaps (). Flaps for most dogs must be bigger and therefore are often constructed differently; except in rural areas they tend to give access to fenced-in yards or gardens rather than the neighborhood at large.

The simplest are just weighted flaps, but these can have problems with wind blowing open the flap or making a rattling noise. A magnet on the flap addresses this issue by holding the door in place when not in use, but not so securely as to prevent access. Sometimes a flap will also have adjustable catches to restrict the opening of the flap in one direction or the other — for example to allow the animal to come in, but not go out again. More sophisticated flaps have electromagnetic catches that can detect a matching permanent magnet worn on the animal's collar and unlock the flap as the animal approaches, thus preventing any other animals using the flap to enter the house.

Devotees suggest a pet door should be set at a height so that the bottom of the opening is just a little lower than the belly of the animal when standing. Many animals prefer to use a flap with a transparent flap, so that they can be sure there is nothing threatening outside before leaving the safety of the home.

The invention of the cat flap is often attributed to Sir Isaac Newton in the seventeenth century; this story, however, is usually related (, for example) without any sources to support it.

Read more at Wikipedia.org


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Pet Cat Kitty Door 4-Way Lockable Magnetic Entrance Little Safe Flap Door GatePet Cat Kitty Door 4-Way Lockable Magnetic Entrance Little Safe Flap Door Gate $9.99 Pet Door for Small Dogs and Cats up to 19 lbs, 4 Way Clear Locking Screen KitPet Door for Small Dogs and Cats up to 19 lbs, 4 Way Clear Locking Screen Kit $16.98
Pet Flap Door 6" X 6" Opening-Magnetic Closure-Pets Lockable up to 12 lbs New!Pet Flap Door 6" X 6" Opening-Magnetic Closure-Pets Lockable up to 12 lbs New! $6.99 PetSafe 2 Way Split AdapterPetSafe 2 Way Split Adapter $14.00
New PetSafe 4-Way Locking Cat & Dog Lockable Pet Door Flap Small 6x5 Hpa11-10876New PetSafe 4-Way Locking Cat & Dog Lockable Pet Door Flap Small 6x5 Hpa11-10876 $14.99 Top Thin Silicone Airline To Being 8 Feet And 25 Feet New Lot Of FiveTop Thin Silicone Airline To Being 8 Feet And 25 Feet New Lot Of Five $18.99
PetSafe Big Cat Door (Up to 25 Pounds)PetSafe Big Cat Door (Up to 25 Pounds) $15.00 Door Buddy® Baby Proof Door Lock Plus Foam Finger Pinch Guard & Door StopperDoor Buddy® Baby Proof Door Lock Plus Foam Finger Pinch Guard & Door Stopper $18.97
Small pet door New sealed in package Tuffi door by JohnsonSmall pet door New sealed in package Tuffi door by Johnson $19.99 Cat Mate 305 Door and Wall Framing KitCat Mate 305 Door and Wall Framing Kit $29.99 to $179.99
PetSafe 2-Way Locking Indoor Cat Door Cc10-050-11PetSafe 2-Way Locking Indoor Cat Door Cc10-050-11 $15.00 Lockable Cat Flap Door Kitten Dog Pet Lock Suitable for Any Wall or Door #S5Lockable Cat Flap Door Kitten Dog Pet Lock Suitable for Any Wall or Door #S5 $10.55 to $10.87
Ideal Hefty Kat Large Cat Door Pet Interior Exterior Lockable 7" X 10" FlapIdeal Hefty Kat Large Cat Door Pet Interior Exterior Lockable 7" X 10" Flap $28.99 4 Way Medium Small Cat Puppy Dog Magnetic Lockable Safe Flap Door Gate White4 Way Medium Small Cat Puppy Dog Magnetic Lockable Safe Flap Door Gate White $12.59
4 Way Small Medium Pet Cat Kitten Dog Supply Lock Lockable Safe Flap Door Us4 Way Small Medium Pet Cat Kitten Dog Supply Lock Lockable Safe Flap Door Us $10.99 SureFlap Microchip Cat Door Connect with Hub Value BundleSureFlap Microchip Cat Door Connect with Hub Value Bundle $162.00 Was:  Previous Price $180.00
4-Way Pet Cat Puppy Dog Gates Door Lock Lockable Safe Flap Locking Gate White Us4-Way Pet Cat Puppy Dog Gates Door Lock Lockable Safe Flap Locking Gate White Us $11.59 PetSafe Electronic SmartKey for use with SmartDoor Pac11-11045 With 2 Extra BattPetSafe Electronic SmartKey for use with SmartDoor Pac11-11045 With 2 Extra Batt $14.99
Pride Replacement Flaps (fits Johnson & Petsafe Ultimate)Pride Replacement Flaps (fits Johnson & Petsafe Ultimate) $49.99 to $99.99 New listing
		PetSafe Interior 2-Way Locking Cat Door Small 1-15 lbs WhiteNew listing PetSafe Interior 2-Way Locking Cat Door Small 1-15 lbs White $8.99
Us Pet Screen Door Dog Footprint Pattern Pet Cat Door Window Screen Doggie FlapUs Pet Screen Door Dog Footprint Pattern Pet Cat Door Window Screen Doggie Flap $11.99 to $30.48 4-Way Magnetic Locking Cat Pet Dog door The Kitty Pass Interior Window Flaps Us4-Way Magnetic Locking Cat Pet Dog door The Kitty Pass Interior Window Flaps Us $13.99
New listing
		PetSafe 4-Way Locking Cat Flap/Door , New In BoxNew listing PetSafe 4-Way Locking Cat Flap/Door , New In Box $15.00 PetSafe Deluxe Cat Flap Door New Open Access SuppliesPetSafe Deluxe Cat Flap Door New Open Access Supplies $11.99 Was:  Previous Price $19.99
Pet Screen Door Dog Footprint Pattern Cat Window Screen Doggie Flap Pet SuppliesPet Screen Door Dog Footprint Pattern Cat Window Screen Doggie Flap Pet Supplies $13.59 to $30.48 PetSafe Cat FlapPetSafe Cat Flap $9.69 List price:  Previous Price $10.99
4 Way Large Pet Cat Puppy Dog Door Flap Locking Lockable Safety Gate L Size Us4 Way Large Pet Cat Puppy Dog Door Flap Locking Lockable Safety Gate L Size Us $13.95 Cat door The Kitty Pass Interior Cat Door, Pet Door Hidden Litter BoxCat door The Kitty Pass Interior Cat Door, Pet Door Hidden Litter Box $34.95
Ideal Lockable Cat Flap Pet Door 4 Way Weatherproof Small Size New In BoxIdeal Lockable Cat Flap Pet Door 4 Way Weatherproof Small Size New In Box $19.99 Cat door The Kitty Pass Xl Large Cat Door, Hidden Litter box Large Pet DoorCat door The Kitty Pass Xl Large Cat Door, Hidden Litter box Large Pet Door $44.95
Petsafe "Extreme Weather" Pet DoorPetsafe "Extreme Weather" Pet Door $79.99 to $149.99 PetSafe Microchip Cat Door FlapPetSafe Microchip Cat Door Flap $89.95 List price:  Previous Price $109.95
Trixie 4-Way Cat Flap Door New NibTrixie 4-Way Cat Flap Door New Nib $12.00 4 Way Lockable Dog Cat Flap Door Kitten Puppy Pets Plastic Security Gate S-Xl4 Way Lockable Dog Cat Flap Door Kitten Puppy Pets Plastic Security Gate S-Xl $10.82 to $24.31 Was:  Previous Price $13.05
Pet Door Small Dog/Cat for Medium Large Cats Freely Coming in and Going Out _Pet Door Small Dog/Cat for Medium Large Cats Freely Coming in and Going Out _ $19.99 Pet Door with Rigid Flap 4-Way Lock Weatherproof Small Dog Cat 6 1/4" squarePet Door with Rigid Flap 4-Way Lock Weatherproof Small Dog Cat 6 1/4" square $6.95
PetSafe Big Cat Door 4-Way Locking White Interior/Exterior Ppa00-11326PetSafe Big Cat Door 4-Way Locking White Interior/Exterior Ppa00-11326 $25.00 Cat Flap 2-Way Door Home Entry Small Dog Pet Exit Simple InstallationCat Flap 2-Way Door Home Entry Small Dog Pet Exit Simple Installation $8.90
4-Way Locking Cat Door Interior Lockable Pet Flap Magnetic Lock Flap Door Gate4-Way Locking Cat Door Interior Lockable Pet Flap Magnetic Lock Flap Door Gate $11.59 Ideal Pet Products Side Sliding Window Door Hefty Cat Flap sizes 30" to 42" HighIdeal Pet Products Side Sliding Window Door Hefty Cat Flap sizes 30" to 42" High $169.95 to $190.95
Perfect Pet 23-28" Chubby-Kat Sash Window DoorPerfect Pet 23-28" Chubby-Kat Sash Window Door $175.99 to $202.39 List price:  Previous Price $219.99 Coffee 4 Ways Lockable Dog Cat Kitty Door Security Flap Gate Pet Supplies #S5Coffee 4 Ways Lockable Dog Cat Kitty Door Security Flap Gate Pet Supplies #S5 $13.05 to $23.50
Generic 4 Way Pet Cat Kitten Dog Supply Lock Lockable Safe Flap Door Durable NewGeneric 4 Way Pet Cat Kitten Dog Supply Lock Lockable Safe Flap Door Durable New $10.89 New listing
		Ideal Pet Products Cat Flap Door with 4 Way Lock, 6 1/4” X 6 1/4” Flap SizeNew listing Ideal Pet Products Cat Flap Door with 4 Way Lock, 6 1/4” X 6 1/4” Flap Size $19.00
4 Way L Size Magnetic Lock Lockable Safe Flap Door Large Pet Cat Puppy Dog4 Way L Size Magnetic Lock Lockable Safe Flap Door Large Pet Cat Puppy Dog $13.99 New!SureFlap Microchip Pet Door Connect + Hub App-Controlled Microchip Pet DoorNew!SureFlap Microchip Pet Door Connect + Hub App-Controlled Microchip Pet Door $250.00
Small White 4-Way Magnetic Frame Lockable Dog Pet Cat Safe Lock Flap Door GateSmall White 4-Way Magnetic Frame Lockable Dog Pet Cat Safe Lock Flap Door Gate $11.99 4 Way Large Medium Pet Cat Puppy Small Dog Door Flap Locking Interior Safe Gate4 Way Large Medium Pet Cat Puppy Small Dog Door Flap Locking Interior Safe Gate $11.59
Trixie Pet Products 4-Way Locking Cat Door, WhiteTrixie Pet Products 4-Way Locking Cat Door, White $17.95 Medium Pet Flap For Cats or Dogs - 7 1/2" by 10 1/2" Large Cats Medium Dogs 25lbMedium Pet Flap For Cats or Dogs - 7 1/2" by 10 1/2" Large Cats Medium Dogs 25lb $19.99
Ideal Perfect Pet Aluminum Sash Window Cat Door in 3 sizes for cats up to 12 lbsIdeal Perfect Pet Aluminum Sash Window Cat Door in 3 sizes for cats up to 12 lbs $119.95 to $136.95 On Sale 4 Way Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door Us StockOn Sale 4 Way Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door Us Stock $10.83
Petsafe Electronic Smart DoorPetsafe Electronic Smart Door $229.99 Never Used ! Cat Mate 4 Way Locking Cat Flap with Door Liner White New In BoxNever Used ! Cat Mate 4 Way Locking Cat Flap with Door Liner White New In Box $14.99
Endura Flap™ Pet Door for DoorsEndura Flap™ Pet Door for Doors $229.00 to $539.00 Ani Mate Cat Mate Cat Collar Magnets for Electromagnetic DoorsAni Mate Cat Mate Cat Collar Magnets for Electromagnetic Doors $21.81
Doggie Door Petsafe Staywell. 4 Way LockDoggie Door Petsafe Staywell. 4 Way Lock $14.95 Interior 4-Way Locking Cat Flap Door Magnetic Lockable Home Pet Safe Entry GateInterior 4-Way Locking Cat Flap Door Magnetic Lockable Home Pet Safe Entry Gate $11.59
Cathole Chwm Pet Door For Cats With Removeable BrushCathole Chwm Pet Door For Cats With Removeable Brush $32.89 Door Buddy® Door Strap & Latch | Dog Proof The Cat's Litter Box without pet gateDoor Buddy® Door Strap & Latch | Dog Proof The Cat's Litter Box without pet gate $15.94
Perfect Pet Cat Flap DoorPerfect Pet Cat Flap Door $18.00 Cat Mate 4 Way Lockable Pet Cat Door Flap Brown 309B 7.7/8"Cat Mate 4 Way Lockable Pet Cat Door Flap Brown 309B 7.7/8" $5.97 Was:  Previous Price $11.95
Staywell Infra-Red Cat Flap 4-Way Locking - Brand NewStaywell Infra-Red Cat Flap 4-Way Locking - Brand New $9.99 PetSafe 2-way Interior Cat Door - Cd10-050-11 Small Pet 1-15 Lbs. PetitePetSafe 2-way Interior Cat Door - Cd10-050-11 Small Pet 1-15 Lbs. Petite $11.50
PetSafe 2-Way Cat Flap DoorPetSafe 2-Way Cat Flap Door $20.99 Pet Cat Kitty Door 4-Way Locking Magnetic Kitten Entrance Safe Gate Little BoxPet Cat Kitty Door 4-Way Locking Magnetic Kitten Entrance Safe Gate Little Box $11.59
PetSafe Cd10-050-11 2 Way Plastic Locking Animal Flap For Small PetsPetSafe Cd10-050-11 2 Way Plastic Locking Animal Flap For Small Pets $13.00 List price:  Previous Price $15.99 00004000
6 x 6.5 inch White Medium 2-Way Locking Cat Flap Door Home Dog Petfs Brand Nib00004000 6 x 6.5 inch White Medium 2-Way Locking Cat Flap Door Home Dog Petfs Brand Nib $11.95
Oxgord Pet Door For Cats & Dogs Up To 15 Lbs. Ptdr-0110 New In BoxOxgord Pet Door For Cats & Dogs Up To 15 Lbs. Ptdr-0110 New In Box $6.99 Was:  Previous Price $9.99 Ideal Pet Products ~ Model Spf ~ Small locking Cat FlapIdeal Pet Products ~ Model Spf ~ Small locking Cat Flap $22.99
PetSafe Single Dog Door Replacement Flap Large 10" x 15" - 4-0113-11PetSafe Single Dog Door Replacement Flap Large 10" x 15" - 4-0113-11 $34.95 Pet Cat Interior 4-Way Locking Small Dog Kitty Flap White Catflap Safe Door GatePet Cat Interior 4-Way Locking Small Dog Kitty Flap White Catflap Safe Door Gate $11.59
PetSafe 4-Way Locking Cat Door w/Tunnel White Interior/Exterior Ppa00-11325PetSafe 4-Way Locking Cat Door w/Tunnel White Interior/Exterior Ppa00-11325 $36.95 Lynx Cat Door for Pets – 4 Way Locking Flap for Interior Doors & Exterior F ShipLynx Cat Door for Pets – 4 Way Locking Flap for Interior Doors & Exterior F Ship $40.50
Perfect Pet Lockable Cat Flap Opening 6 1/4"x 6 1/4" NewPerfect Pet Lockable Cat Flap Opening 6 1/4"x 6 1/4" New $21.96 Was:  Previous Price $27.45 New Open Box PetSafe Big Cat Door 4-Way 1-25 lb White Model Hpa11-10888New Open Box PetSafe Big Cat Door 4-Way 1-25 lb White Model Hpa11-10888 $22.97
Puppy 4 Ways Magnetic Locking Wall-Mount Door Pet Cat Door Flap Wall Mount DoorPuppy 4 Ways Magnetic Locking Wall-Mount Door Pet Cat Door Flap Wall Mount Door $9.96 to $11.28 00006000 Large cat door, new.Large cat door, new. $19.99
Endura Flap™ Locking CoversEndura Flap™ Locking Covers $29.00 to $49.00 Ceese Magnetic cat door flap, with locksCeese Magnetic cat door flap, with locks $6.00
Premier Pet Locking Pet Door for Cats or Small Dogs up to 25 Pounds 4way LockPremier Pet Locking Pet Door for Cats or Small Dogs up to 25 Pounds 4way Lock $19.99 Perfect Pet TubbyKat DoorPerfect Pet TubbyKat Door $29.00
Cat Door Flap 4-Way Small Dog Magnetic Closure Transparent Plastic Lockable PetCat Door Flap 4-Way Small Dog Magnetic Closure Transparent Plastic Lockable Pet $21.74 Was:  Previous Price $28.99 PetSafe big cat/small dog lockable in/out door installation kit,Nip but openedPetSafe big cat/small dog lockable in/out door installation kit,Nip but opened $29.39
4 Way Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door Gate Frame S M L4 Way Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door Gate Frame S M L $11.29 to $15.29 4 Way Locking Waterproof Pet Doors Interior Exterior Cat Flap Door for Cats Us4 Way Locking Waterproof Pet Doors Interior Exterior Cat Flap Door for Cats Us $15.06 to $21.46 List price:  Previous Price $23.99
PetSafe 4-Way Locking Interior/Exterior Cat Door for 1-15lb Pets NewPetSafe 4-Way Locking Interior/Exterior Cat Door for 1-15lb Pets New $4.80 Was:  Previous Price $11.99 Ideal "Cat Sash" Cat Doors for Sash WindowsIdeal "Cat Sash" Cat Doors for Sash Windows $159.99 to $169.99
White 4Way Lockable Pet Cat Kitty Safe Pass Interior Flap Door Gate Small MediumWhite 4Way Lockable Pet Cat Kitty Safe Pass Interior Flap Door Gate Small Medium $11.59 4 Way Locking Lockable Pet Cat Dog Magnetic Lock Flap Door Entrance Gate Box Us4 Way Locking Lockable Pet Cat Dog Magnetic Lock Flap Door Entrance Gate Box Us $9.99
4 Way Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door Gate Frame Usstock4 Way Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door Gate Frame Usstock $13.99 New listing
		Staywell White Infra-Red Cat Flap Pet Door 4 Way Locking "New Old Stock"New listing Staywell White Infra-Red Cat Flap Pet Door 4 Way Locking "New Old Stock" $9.99
Petsafe 4-Way Locking Interior Cat FlapPetsafe 4-Way Locking Interior Cat Flap $10.00 Cat Mate Elite Super Selective Pet Id Cat Door With Timer Control 305wCat Mate Elite Super Selective Pet Id Cat Door With Timer Control 305w $59.99
PetSafe Microchip Cat Door Key Fob for Ppa19-16145PetSafe Microchip Cat Door Key Fob for Ppa19-16145 $14.95 List price:  Previous Price $19.95 Interior 4 Way Pet Cat Door Locking Magnetic Entrance Safe Gate Plastic White SInterior 4 Way Pet Cat Door Locking Magnetic Entrance Safe Gate Plastic White S $9.99
PetSafe Big Cat Large See-Through Rigid Flap Cat DoorPetSafe Big Cat Large See-Through Rigid Flap Cat Door $19.25 Cathole Pet Door for Cats with Brush, Never OpenedCathole Pet Door for Cats with Brush, Never Opened $20.00
Cat Door 4 way Locking Pets Cat Small Dog Flap White Cat Flap Pet Door Y7 03Cat Door 4 way Locking Pets Cat Small Dog Flap White Cat Flap Pet Door Y7 03 $9.79 4 Way Medium Small Pet Cat Kitty Puppy Small Dog Door Flap Locking Safe Gate Us4 Way Medium Small Pet Cat Kitty Puppy Small Dog Door Flap Locking Safe Gate Us $11.59
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Prices current as of last update, 10/10/19 9:27pm.

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