YGNNJY BSYTYM-917 X-Large Sliding Glass Dog Door, Adjustable White Aluminum Frame

For pet owners who want to add access without making permanent alterations, this sliding glass dog door fits into an existing door track. Its adjustable height and built-in flap create a dedicated passage for a large dog while keeping the sliding-door setup central to the installation.

The white aluminum frame adjusts from 75 4/5" to 80 3/10" to fit the track height. That range helps you match the insert to your sliding glass door before securing it in place.

A spacious magnetic flap is designed for extra-large dogs weighing up to 200 lbs. A locking mechanism lets you restrict access when needed, such as at night or when you are away.

Benefits

The track-insert design offers a practical alternative to permanently modifying a door: the pet door installs in an existing sliding glass door track. This makes it useful for households that want a dedicated route outdoors while retaining the sliding-door arrangement. The adjustable height supports a more tailored fit within its stated range, and the aluminum frame is built for daily use and weather exposure.

The opening is designed for large and giant dogs, with a stated capacity of up to 200 lbs. A magnetic flap provides the pet passage, while the locking mechanism gives you a way to restrict access when you want the opening closed. For example, you can allow your dog to move between the home and outside during the day, then secure the pet door at night.

It suits you if you have a large dog and want a sliding-track installation rather than permanent door alterations. The white finish keeps the insert visually suited to a light-colored door frame.

At a glance

• Type: Sliding glass pet door insert
• Size: X-Large
• Height adjustment: 75 4/5" to 80 3/10"
• Pet size: Large and giant dogs, up to 200 lbs
• Frame: Aluminum
• Color: White
• Features: Magnetic flap and locking mechanism
• Model: BSYTYM-917

Practical tips

Measure the height of your sliding door track and compare it with the insert’s adjustment range before installation. Position the insert in the existing track according to its setup, then use the locking mechanism whenever you want to restrict pet access. These steps help match the door to your space and make its everyday use straightforward.

Is it worth it?

This insert brings together the features that matter for a large-dog sliding-door setup: an adjustable height, an aluminum frame, a magnetic flap, and a locking mechanism. Its track-based installation is especially useful when you want to give your dog a dedicated passage without permanently altering the door. For homes with a sliding glass door and an extra-large pet, it offers a clear, practical way to support everyday indoor-outdoor access.