How to Measure for a Dog Door Size

Pet doors are a wonderful invention for both dogs, cats and their human companions, making it easy for pets to get in and out of the house whether they're home alone or not. Doggie doors allow our canine companions the freedom to leave the house for the backyard, terrace or patio unless the doors are too heavy or the opening is too snug. It's amazing how large a dog can fit though the small doggie door, but being able to doesn't mean it's the right fit.

Things You'll Need

  • Tape measure
  • Pencil
  • Pad of paper
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Instructions

    • 1

      Measure the widest part of your dog and add a little to it. This will be the opening width of the door. To find the height, measure from the top of his shoulders to his chest just behind his front legs. Don't measure all the way down to his paws. The door doesn't need to be that long.

    • 2

      Wedge open an interior house door the opening width and block off the opening height starting just above your pet's shoulder and call your pet through. Dogs duck their heads as they push open their dog door and step through it, so ideally you should install the dog door with the top of the opening just above your pet's shoulder. As long as your dog or cat can open the door and get through comfortably, any position will be OK.

    • 3

      Decide what type of dog door you want to install. All doors open both ways so dog can come and go, and close after your dog gone through. Some use magnets to keep them shut and a few operate with a spring. Dog doors have a lock or close-off cover to keep your pet in or out. There are even some electronic doors that will only open and close for your pet while she's wearing her special collar. This helps to keep critters out if that's an issue.

    • 4

      Consider where the door will be placed and whether you'll need help in the installation. There are different door types for screens, sliding glass doors, wood door and walls. Does your dog go out frequently? Is she a high-energy dog? If so, a metal frame will be sturdier. If you have a low-energy pet, if the door is for indoors, room to room, and you're in a temperate climate, a plastic frame may work for you.