Pocket Dog/Kid Gate And i am thinking if you have a small/obediant dog you could put wheels on it and those door stop thingees so it will stand instead of a hole in the wall to slide it.
A Retractable Safety Gate for Kids and Pets
Retract-A-Gate retractable safety gates are designed for durability, security, ease of use, and one-handed operation. Made in the USA and certified for use on stairs, Retract-A-Gate is built to keep your baby, dog, or cat safer. Available in three colors: Café, White and Black.
Summer Infant Sure and Secure Stairs Gate with Banister Kit (Discontinued by Manufacturer)
Amazon.com : Summer Infant Sure and Secure Stairs Gate with Banister Kit (Discontinued by Manufacturer) : Indoor Safety Gates : Baby
Toys, Games, & More
Toys”R”Us is the leading kids store for all toys, video games, dolls, action figures, learning games, building blocks and more. C'mon, Let's Play!
Banister & Stair, Top of Stairs Gate with Dual Installation Kit
The ultra-versatile Stylish&Secure® Deluxe Top of Stairs Gate with Dual Banister Kit works for top or bottom of stairs—with one or two banisters—and in doorways or other openings. Easy to remove/reinstall, and has two-step opening for extra security.