With the two-flap dog door, these measurements are for the opening in the outer flap. Because of the necessary overlaps, I made the opening in my front door a little wider and longer. (The inside of the house is also about 5 inches lower than the outer step, so I added an inch or two for that. With luck you won't need to consider this issue.)
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These pet doors for sliding glass doors aren't only for dogs. In fact, they may be a better choice for cats than the ones intended specifically for cats! The reason is that each manufacturer generally offers a "Small" size and the flaps are all flexible and, therefore, safer than rigid "cat flaps".
Replacement Flaps for Pet Doors | Parts & Accessories
Some pet doors guard against the weather better than others. A well made pet door will keep the weather outside while letting your pets inside, as well as be durable enough to withstand the elements! Top choices for weather-proof dog and cat doors for sliding glass doors would be brands like Endura Flap () and Hale (and ).
Flaps & Parts For Your Pet Door
Pet doors vary widely in sealing capabilities. Some have single flap versions that seal just as well or better than other brand’s double flap dog doors. A single is one of such doggie doors and is often plenty enough for even extreme weather. Give your pet the continuing freedom it deserves and the security you deserve with these replacement flaps for our large plastic doggie doors. These replacement flaps are for our Havahart Plastic Pet Doors, our top-of-the-line doggie doors, which come in a variety of opening sizes for any size cat or dog. They have a magnetic energy seal. These individual replacement PVC flaps allow you to replace only the flap and not the whole unit. This replacement flap goes with our #7112 Large Plastic doggie doors. (These doggie doors accommodate door widths from 7/8 inches to 2-1/4 inches.). The small doggie doors and replacement flaps are for pets 7-15 lbs. Our medium doggie doors and replacement flaps are for pets up to 40 lbs., and our large doggie doors and replacement flaps accommodate pets up to 100 lbs. Havahart plastic replacement flaps for our doggie doors are recommended for indoor applications or outdoor access to covered areas, as well as outdoor applications for temperate climates. They are suited for low to medium usage. Allow your pets the freedom to enter and exit on their own with our doggie doors and replacement flaps.