We bought this for our 86lb and 13lb dogs.
I placed it lower in the door for the little dog, but our big dog has no problem going through it.
I really like how the sliding, locking door works.
It DOES NOT come with a template or mounting instructions. But if you know what you're doing, it should not be any problem.
I highly recommend taking a medium sized Sharpie and drawing an outline of the inside part of the doggie door onto your door (inside part of the door).
Once you've drawn the outline, cut to the outside of the drawing and this will give you the room to drop the door right into place.
Also do the same thing w/the outside of the doggie door and your door and you'll be good to go.
NOTE: If you have an aluminum skinned door, be sure to use a very fine metal jigsaw blade to stop any possible warping.
Hope this helps you make up your mind.
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