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The best place to install a dog door is on an exterior door that leads to a fenced-in area of your rear yard. This position will let your dog go in and out as they need and still keep them safe in your yard when they’re outside. You should plan on installing the bottom of the doggie door a minimum of 3 inches above the bottom of your exterior door to maintain the structural integrity of the door, and never cut out a hole within 3 inches of exterior door glass.

Most modern door knobs will all fit in standard, modern doors, so if you know your door was made in the last 50 years or so, you should be fine buying a standard replacement door knob. The only exception would be a thumb latch handleset for an exterior door, as this type of door knob may not fit your door without drilling a mounting hole for the bottom of the handle. Antique or custom doors might also have different sizes and knob mounting holes, so call in a professional if you don’t believe your door is a standard one.

The vast majority of hinges are symmetrical, and either side of the hinge can go on the door or the frame. Occasionally, you'll find a hinge specifically made for right or left-handed doors with different attachment hardware or larger plates on one side. In most cases, the large side of the hinge goes on the frame.

It is possible to install hinges backward, so be careful when placing them. Position the hinge so that the hinge pin faces the direction the door will swing. For example, if you're standing on the side the door will open into, the pin should be visible. Be extra careful when installing exterior doors, as placing the hinges on the outside for an outward-facing door makes your home much easier to break into.

To maintain a door and prevent future issues, regularly clean it, check and lubricate the hinges and locks, inspect the hardware, and check the weatherstripping for signs of wear to prolong its lifespan and functionality.