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

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Dog Doors

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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PetSafe 1-Piece Classic Replacement Flap, Large, 4-0113-11, New, Free ShippingPetSafe 1-Piece Classic Replacement Flap, Large, 4-0113-11, New, Free Shipping $26.54 Ideal Pet Extra Large AirSeal Pet Door Telescoping 10-1/4 In. X 15-3/4 In.NewIdeal Pet Extra Large AirSeal Pet Door Telescoping 10-1/4 In. X 15-3/4 In.New $82.78
Ideal Xlarge Replacement Flap For Ruff Weather Pet Door Single Flap Rwrfxl UsaIdeal Xlarge Replacement Flap For Ruff Weather Pet Door Single Flap Rwrfxl Usa $27.47 Wall Entry Pet Door Installation Kit Extra Large Ruff-Weather Dog Cat upto 90lbsWall Entry Pet Door Installation Kit Extra Large Ruff-Weather Dog Cat upto 90lbs $59.25
PetSafe Aluminum Frame Wall Mount Entry Pet Dog DoorsPetSafe Aluminum Frame Wall Mount Entry Pet Dog Doors $79.99 Dog Cat Flap Doors with 4 Way Lock for Pets Entry & Exit-2016 New DesignDog Cat Flap Doors with 4 Way Lock for Pets Entry & Exit-2016 New Design $5.50 List price:  Previous Price $69.95
Pet Door Large Frame Durable Easy Install Dog Doggie Flap Mount Secure MediumPet Door Large Frame Durable Easy Install Dog Doggie Flap Mount Secure Medium $114.1 00004000 6 PetSafe Wall Dual Entry Aluminium Telescoping Pet Door for DogsPetSafe Wall Dual Entry Aluminium Telescoping Pet Door for Dogs $78.99 to $129.90
Trixie Plastic Flap Door for Log Cabin Dog HouseTrixie Plastic Flap Door for Log Cabin Dog House $9.78 to $17.31 List price:  Previous Price $24.98 Extra Large Xl 16"X 13" automatically Magnetic Lockable Pet Cat Dog Flap DoorExtra Large Xl 16"X 13" automatically Magnetic Lockable Pet Cat Dog Flap Door $38.90
PetSafe Ppa00-10959 Premium White Pet Door (Medium)PetSafe Ppa00-10959 Premium White Pet Door (Medium) PetSafe Freedom Aluminum Patio Panel Sliding Pet Door to 81" : Medium SizePetSafe Freedom Aluminum Patio Panel Sliding Pet Door to 81" : Medium Size $129.00 Trending at $166.10
PetSafe Smart Door Electronic Pet Dog - Large Small Sizes SmartDoorPetSafe Smart Door Electronic Pet Dog - Large Small Sizes SmartDoor $114.95 to $154.95 PetSafe Freedom Aluminum Pet Dog Doors Small, Medium, Large, X-LargePetSafe Freedom Aluminum Pet Dog Doors Small, Medium, Large, X-Large $50.99 to $70.99
PetSafe Pet Door Flap Pac11-11037 Freedom Dog and Cat Door NewPetSafe Pet Door Flap Pac11-11037 Freedom Dog and Cat Door New $19.39 PetSafe Dog Door Heavy Duty Large Pet Doggie Ruff Extreme Weather Tri Flap BestPetSafe Dog Door Heavy Duty Large Pet Doggie Ruff Extreme Weather Tri Flap Best $135.70
PetSafe SmartDoor Smart Door Electronic Pet DoorPetSafe SmartDoor Smart Door Electronic Pet Door $89.95 to $139.95 Ideal Pet Products Replacement Flap for Ultra Flex Extra Large Dog Cat Pet DoorIdeal Pet Products Replacement Flap for Ultra Flex Extra Large Dog Cat Pet Door $44.73
Fast Fit Pet Patio Door Cat Flap - White Frame 77 5/8" to 80 3/8"Fast Fit Pet Patio Door Cat Flap - White Frame 77 5/8" to 80 3/8" $191.94 Ideal Pet Products New Style Plastic/Deluxe Pet Door, Extra Large, 10.25" xIdeal Pet Products New Style Plastic/Deluxe Pet Door, Extra Large, 10.25" x $22.09
pac11-11038 Petsafe replacement Flap Medium Freedom Pet doorpac11-11038 Petsafe replacement Flap Medium Freedom Pet door $24.99 PetSafe Extreme Weather Pet Dog Doors W/ Triple Flaps Large Med Small SizesPetSafe Extreme Weather Pet Dog Doors W/ Triple Flaps Large Med Small Sizes $74.95 to $114.95
New PetSafe Panel Pet Door Insert a5New PetSafe Panel Pet Door Insert a5 $69.99 Ideal Pet Products Ruff Plastic Sl Rwsl Pet Door NewIdeal Pet Products Ruff Plastic Sl Rwsl Pet Door New $165.00 Trending at $182.69
Premium Draft-Stopper Pet Door - MediumPremium Draft-Stopper Pet Door - Medium $129.95 Ideal Pet Products 33Swdxl Replacement Flap For Ultra Flex Large Pet Door NewIdeal Pet Products 33Swdxl Replacement Flap For Ultra Flex Large Pet Door New $30.79 Trending at $35.76
Patio Tempered Sliding Glass for Pets Magnetic Durable Aluminum Frame MediumPatio Tempered Sliding Glass for Pets Magnetic Durable Aluminum Frame Medium $160.53 Trending at $169.96 PetSafe Wall Entry Aluminum Pet Door with Telescoping Tunnel, Taupe and White,PetSafe Wall Entry Aluminum Pet Door with Telescoping Tunnel, Taupe and White, $68.19
PetSafe Extreme Weather Large Pet Door Ppa00-10986 NewPetSafe Extreme Weather Large Pet Door Ppa00-10986 New $85.00 4 Way Medium Small Large Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door4 Way Medium Small Large Pet Cat Puppy Dog Magnetic Lock Lockable Safe Flap Door $8.99 to $10.99
Petsafe Ppa00-10985 Extreme Weather Pet Door (Medium)Petsafe Ppa00-10985 Extreme Weather Pet Door (Medium) $79.95 PetSafe Extreme Weather Pet Door White, 3 Sizes Small, Medium, LargePetSafe Extreme Weather Pet Door White, 3 Sizes Small, Medium, Large $54.95 to $81.95
Dog Door Replacement Flap Pet Entry Weather Pets Cats Dogs Exit Closure HouseDog Door Replacement Flap Pet Entry Weather Pets Cats Dogs Exit Closure House $18.79 New listing
		Oem PetSafe 1-Piece Classic Replacement Flap, Large, 4-0113-11, NewNew listing Oem PetSafe 1-Piece Classic Replacement Flap, Large, 4-0113-11, New $23.99
pet screen door dog door for sliding door, sliding doggy door insert Newpet screen door dog door for sliding door, sliding doggy door insert New $61.43 Patio Panel Pet Door Dog Cat Sliding Glass Flap Exterior Safety Lock AdjustablePatio Panel Pet Door Dog Cat Sliding Glass Flap Exterior Safety Lock Adjustable $157.95 Trending at $169.92
Medium Dog Door Flap Pet Gate Cat Doggie Safe Wall Entry Patio Enclosure PetSafeMedium Dog Door Flap Pet Gate Cat Doggie Safe Wall Entry Patio Enclosure PetSafe $41.26 Trixie Pet Products 2-Way Locking Dog Door For Medium to X-Large Dogs White 3879Trixie Pet Products 2-Way Locking Dog Door For Medium to X-Large Dogs White 3879 $40.60
High Tech Pet Wall Adapter Tunnel Wa-1 for Power Pet Px-1 Extension Door MediumHigh Tech Pet Wall Adapter Tunnel Wa-1 for Power Pet Px-1 Extension Door Medium $14.95 Petsafe Replacement Flap for Classic, Deluxe Panel and Wall Entry Dog DoorsPetsafe Replacement Flap for Classic, Deluxe Panel and Wall Entry Dog Doors $19.85 to $38.85
Ideal Pet Products Replacement Flap For Ruff Weather Pet Door Rwrfxl NewIdeal Pet Products Replacement Flap For Ruff Weather Pet Door Rwrfxl New $29.26 Pair 2 Ruff Weather Replacement Flaps all sizesPair 2 Ruff Weather Replacement Flaps all sizes $35.00 to $74.00
e-Cat Electronic Pet Dog Cat Doore-Cat Electronic Pet Dog Cat Door $95.00 Dog Cat Door Weather Ruff w Telescoping Frame Extra Large Flap Wall Tunnel KitDog Cat Door Weather Ruff w Telescoping Frame Extra Large Flap Wall Tunnel Kit $132.66
Pet Safe X-Large Abs Dog Door Dual Entry Large Flap Lockable Slide Shutter ClsvPet Safe X-Large Abs Dog Door Dual Entry Large Flap Lockable Slide Shutter Clsv $37.78 PetSafe Wall Entry Aluminum Pet DoorsPetSafe Wall Entry Aluminum Pet Doors $154.91
Ideal Pet Products Original Pet Door all sizesIdeal Pet Products Original Pet Door all sizes $23.44 to $85.00 Ideal Pet 5 In. X 7 In. Small Original Frame Pet Door Easy Installation DurableIdeal Pet 5 In. X 7 In. Small Original Frame Pet Door Easy Installation Durable $22.73
The Door Shield Pet Scratch Protector Dog Puppy Cat Screen Furniture Clear GuardThe Door Shield Pet Scratch Protector Dog Puppy Cat Screen Furniture Clear Guard $16.47 Pet Door Dog Flap Cat Small Safe Way Lockable Petsafe Frame Telescoping PlasticPet Door Dog Flap Cat Small Safe Way Lockable Petsafe Frame Telescoping Plastic $7.68
PetSafe Wall Entry Aluminum Dog Door Double Flap System Small, Medium or LargePetSafe Wall Entry Aluminum Dog Door Double Flap System Small, Medium or Large $59.95 to $109.95 PetSafe Freedom Aluminum Pet Door, White, Large NewPetSafe Freedom Aluminum Pet Door, White, Large New $69.99
White 4 Way Lockable Pet Flap Safe Door For Medium Small Cat 5.7" x 6.1" NewWhite 4 Way Lockable Pet Flap Safe Door For Medium Small Cat 5.7" x 6.1" New $8.99 Petsafe Freedom Aluminum Patio Panel Sliding Glass Pet Door, Satin, LargePetsafe Freedom Aluminum Patio Panel Sliding Glass Pet Door, Satin, Large $43.30
PetSafe Wall Entry Aluminum Pet Door Telescoping Tunnel LargePetSafe Wall Entry Aluminum Pet Door Telescoping Tunnel Large $95.00 Trending at $115.16 Ruff Weather, All Weather, Perfect Pet 1 pair Fur Weather Stripping All sizesRuff Weather, All Weather, Perfect Pet 1 pair Fur Weather Stripping All sizes $6.00 to $14.00
Large PetSafe Freedom Aluminum Patio Panel Sliding Glass Pet Door for Dog CatLarge PetSafe Freedom Aluminum Patio Panel Sliding Glass Pet Door for Dog Cat $138.00 Trending at $169.92 PetSafe Small SmartDoor Electronic Dog Door Ppa11-10711PetSafe Small SmartDoor Electronic Dog Door Ppa11-10711 $89.95
Fast Fit Pet Patio Dog Door - Small/Silver Frame 77 5/8" to 80 3/8"Fast Fit Pet Patio Dog Door - Small/Silver Frame 77 5/8" to 80 3/8" $191.94 Ideal Lockable Dog Pet Door Easy Install Super Xx-LargeIdeal Lockable Dog Pet Door Easy Install Super Xx-Large $129.99
Endura Flap Double Flap Pet Door for Doors White Used for 1 monthEndura Flap Double Flap Pet Door for Doors White Used for 1 month $200.00 Ideal Pet Products Replacement Flap Extra Large. Pet Door Dog Cat Xl 10.5" X 15"Ideal Pet Products Replacement Flap Extra Large. Pet Door Dog Cat Xl 10.5" X 15" $23.68
Aluminum Medium Dog Doggie Pet Cat Patio Sliding Glass Door Mount Plastic FlapAluminum Medium Dog Doggie Pet Cat Patio Sliding Glass Door Mount Plastic Flap $134.32 New! PetSafe Large Pet Dog Door Wall Entry Aluminum Insulated Ppa11-10917New! PetSafe Large Pet Dog Door Wall Entry Aluminum Insulated Ppa11-10917 $50.70
PetSafe Replacement Flap for Pet Safe Freedom Dog Door Large NewPetSafe Replacement Flap for Pet Safe Freedom Dog Door Large New $43.94 Petsafe Dog And Cat Door Flap, Medium, 8 1/8" X 12 7/8", Pac11-11038, Tinted ViPetsafe Dog And Cat Door Flap, Medium, 8 1/8" X 12 7/8", Pac11-11038, Tinted Vi $22.66
Petsafe Replacement Flap For Petsafe Freedom Pet Door X-LargePetsafe Replacement Flap For Petsafe Freedom Pet Door X-Large $43.01 Replacement Flap Ideal "Original" Plastic Frame Dog Pet Door-*All Sizes*Replacement Flap Ideal "Original" Plastic Frame Dog Pet Door-*All Sizes* $18.00 to $39.01
4 Way Cat Kitten Dog Lock Lockable Flap Door Gate For Medium Small Pet4 Way Cat Kitten Dog Lock Lockable Flap Door Gate For Medium Small Pet $16.90 PetSafe Freedom Aluminum Patio Panel Sliding Glass Pet Door, 76 13/16'' toPetSafe Freedom Aluminum Patio Panel Sliding Glass Pet Door, 76 13/16'' to $137.83 Trending at $166.10
PetSafe Replacement Flap for PetSafe Freedom Pet DoorPetSafe Replacement Flap for PetSafe Freedom Pet Door $13.01 PetSafe Pet Door Replacement Flap LargePetSafe Pet Door Replacement Flap Large $24.16
Pet Dog Cat Flap Doors with 4 Way Lock for Pets Entry & Exit Locking Lockable UsPet Dog Cat Flap Doors with 4 Way Lock for Pets Entry & Exit Locking Lockable Us $9.99 New Cat Dog Pet Kitty Screen Door Gateway For Patio Doors Windows 12"x16" UsaNew Cat Dog Pet Kitty Screen Door Gateway For Patio Doors Windows 12"x16" Usa $18.90
Electric Automatic Pet Door Translucent Power Panel Bulletproof Resin 8 x 10Electric Automatic Pet Door Translucent Power Panel Bulletproof Resin 8 x 10 $270.52 High Tech Pet Products 2 batteries for Power Pet Collars Ms-4 or Ms-5High Tech Pet Products 2 batteries for Power Pet Collars Ms-4 or Ms-5 $19.95
New listing
		Pet Door Dog 9.75x17 in X Large Dual Flap Weather Proof Wall Install Kit ruffNew listing Pet Door Dog 9.75x17 in X Large Dual Flap Weather Proof Wall Install Kit ruff $90.00 Pet Door Replacement Flap 7 x 11.25 In Dog Clear Flexible Medium Vinyl For FramePet Door Replacement Flap 7 x 11.25 In Dog Clear Flexible Medium Vinyl For Frame $21.50
Dog Pet Window Sill Ledge Protector - Sill Shield Guard Cover Prevents ScratchesDog Pet Window Sill Ledge Protector - Sill Shield Guard Cover Prevents Scratches $13.95 Petsafe Pet Door Flap Small Pac11-11037 Freedom Dog And Cat DoorPetsafe Pet Door Flap Small Pac11-11037 Freedom Dog And Cat Door $16.87
Ideal Super Large Replacement Flap For Original and Aluminum Frames Pet Dog DoorIdeal Super Large Replacement Flap For Original and Aluminum Frames Pet Dog Door $29.87 17" x 14" Extra Large Pet Cat Dog Door Lockable Flap Door Gate Telescoping Frame17" x 14" Extra Large Pet Cat Dog Door Lockable Flap Door Gate Telescoping Frame $38.90
4-Way Locking Pet Door Cats Dogs Flap Door Indoor / Outdoor Large Size4-Way Locking Pet Door Cats Dogs Flap Door Indoor / Outdoor Large Size $16.90 PetSafe Pet Door Replacement Flap, Small, Pac1111037, New, Free ShippingPetSafe Pet Door Replacement Flap, Small, Pac1111037, New, Free Shipping $13.44 List price:  Previous Price $19.99
Sliding Glass Pet Door Aluminum Patio Flap Panel Dog Cat Freedom Large WhiteSliding Glass Pet Door Aluminum Patio Flap Panel Dog Cat Freedom Large White $169.96 Mini Pet Gate with 6 in. Extension off-whiteMini Pet Gate with 6 in. Extension off-white $17.09
Perfect Pet All Weather Pet Doors in Small, Medium, X-Large, or Super Large SizePerfect Pet All Weather Pet Doors in Small, Medium, X-Large, or Super Large Size $79.95 to $135.95 Clawguard® Pet Protection Tape - the Ultimate Dog and Cat Scratch ShieldClawguard® Pet Protection Tape - the Ultimate Dog and Cat Scratch Shield $18.95
PetSafe Electronic SmartKey Smart Key for SmartDoor Pac11-11045PetSafe Electronic SmartKey Smart Key for SmartDoor Pac11-11045 $18.90 Carlson Pet Products Lil' Tuffy Expandable Gate with Small Pet DoorCarlson Pet Products Lil' Tuffy Expandable Gate with Small Pet Door $20.74
Ideal *Ruff Weather* Pet Dog Insulated Door Dual 2 Flaps-*All Sizes*Ideal *Ruff Weather* Pet Dog Insulated Door Dual 2 Flaps-*All Sizes* $87.69 to $182.69 Extreme Weather Pet Door Dog Doors Exterior Cat Entry Large Dogs Heavy Duty NewExtreme Weather Pet Door Dog Doors Exterior Cat Entry Large Dogs Heavy Duty New $54.52
Dog Door Flap Pet Gate Cat Doggie Safe Wall Entry Patio Enclosure Plastic SmallDog Door Flap Pet Gate Cat Doggie Safe Wall Entry Patio Enclosure Plastic Small $34.04 Trixie Plastic Flap Door for Dog Club HouseTrixie Plastic Flap Door for Dog Club House $9.78 to $24.24
2 Way Magnet Pet Cat Dog Puppy Easy Screen Door for Patio Door Window Screens Se2 Way Magnet Pet Cat Dog Puppy Easy Screen Door for Patio Door Window Screens Se $10.85 to $15.95 Pet Door Replacement Flap for Pets Freedom Pet Door Safe Large Plastic Entry NewPet Door Replacement Flap for Pets Freedom Pet Door Safe Large Plastic Entry New $29.22
PetSafe Extreme Weather Large Dog Door Ppa00-10986PetSafe Extreme Weather Large Dog Door Ppa00-10986 $99.95 Trending at $107.45 Pet Door Extra Large Frame Durable Dog Flap Mount Secure 2Way Locking Heavy DutyPet Door Extra Large Frame Durable Dog Flap Mount Secure 2Way Locking Heavy Duty $30.27
Ideal Pet Products Replacement Flap/New Style Plastic/Deluxe Pet DoorIdeal Pet Products Replacement Flap/New Style Plastic/Deluxe Pet Door $22.29 Xl Extra Large Pet Door Premium Aluminum Replacement Flap Freedom Dog Pet SafeXl Extra Large Pet Door Premium Aluminum Replacement Flap Freedom Dog Pet Safe $45.19
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Prices current as of last update, 01/16/18 7:36am.

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