Measure your dog's shoulder height — the highest point on their back, not their head — and add 1–2 inches. That's your minimum flap height. High Tech Pet door mount dog doors are available in medium (up to 30 lbs), large (up to 100 lbs), and XL (up to 130 lbs). If you're between sizes, go up — a slightly larger door is always better than one that's too small. Call 1-800-255-1279 and our team will help you find the right fit.

For maximum technology and security, the Power Pet Roll-Up door mount is the most advanced option — motorized, Wi-Fi enabled, collar activated, hermetically sealed, and fits under low windows where traditional flap doors won't. For a proven automatic door mount, the Power Pet Classic has been the nation's best-selling automatic dog door for over 30 years. For a no-power manual door, the Armor Flex and DuraFlex offer the best weather sealing with no electricity required.

High Tech Pet door mount dog doors install in wood, fiberglass, and hollow-core exterior doors. Steel doors can also work with the right cutting tools. The hole you cut is only the size of the flap opening — the door frame slips in from both sides and locks together with the included hardware. If you're unsure about your door material, call 1-800-255-1279 and our team will walk you through it before you buy.

High Tech Pet automatic doors are collar activated. Each door comes with an ultrasonic collar — simply turn on the door and put the collar on your dog. The door's sensors detect when a pet wearing the collar approaches and the door opens automatically. No training or programming needed. Pets without a collar cannot open the door, keeping strays and wildlife out. Wi-Fi models add app control, 24/7 scheduling, and activity history from anywhere.

Both are premium manual door mount doors with heavy-gauge aluminum construction and rare-earth magnet sealing — no power required. The Armor Flex uses an interlocking segmented flap with horizontal rigidity that compresses side seals for an extremely tight fit. The Dura Flex uses a rare-earth point-magnet system along the entire flap perimeter, tested airtight in winds up to 50 mph. For the harshest climates, the Dura Flex is the stronger choice. For milder climates, both perform exceptionally well.

Door mount installation requires cutting a hole in your exterior door panel with a jigsaw, then inserting the inner and outer frames from each side and securing with the included hardware. It's a straightforward DIY project for most homeowners — typically done in an afternoon with basic tools. The Power Pet Roll-Up and Power Pet Classic require a nearby power outlet. The Armor Flex and Dura Flex require no power at all. Full installation instructions are included, and our team is available at 1-800-255-1279 if you have questions.