Perfect for our 12 pound Shorkie (Shih Tzu/Yorkie).  A larger dog could walk/hop over it.  We don't have a fenced yard, so we put it at the bottom of the steps to our porch.  We used regular bungee cords to attach it to the railing.  We put a doggy door on the screen door out of the house, so she can come in and out as she pleases.  It's also super easy to assemble.  It took about 20 minutes.