27 Amazon pet products that serve their purpose

It has a retractable locking panel with lock so you can restrict access if you don't want your cats to go out. And the whole thing is easy to remove thanks to the spring-loaded frame that lets you lift it right out of the sliding door track.

Promising review: “Our cats took to it immediately! I thought it was going to be a nightmare to train them. One of them jumped through when I installed it AND I even had the main door wide open. It was hilarious! Anyway, I wanted to say that The retractable top makes it easy to attach and remove as desired! This wasn't what I was looking for, but when I discovered this awesome feature, I knew it was a bonus! So I stopped trying to permanently install it with all the screws and left it as it was. Now, if we are away for more than a day, I can simply pull the retractable top down a little and remove the door. I was a little disappointed with the seal, or lack thereof, where the door comes into contact with the PetSafe insert. So I just ran to the store and got a couple different weather strips and put one on the insert and one on our sliding glass door, overlapping them so they seal each other when the door closes. We bought the medium pet door because we have large cats that weigh between 15 and 20 pounds. Our largest fits in easily. I also made a bar that fits between the door to support it and lock it when we're sleeping or away. And last but not least, the included seal for the back of the door is fantastic! Very easy and the sticky stuff is great!” —Lookin4That1Thing

Price: $164.99+ (available in three colors, five sizes and three styles)