I like this CozyUp Folding Pet Steps, my small dog can now reach my bed.  It very simple to set up, the back leg snaps or locks in place, and tread covers that came separately are easy to stick onto each of the steps. One of my small dogs had a hard time before jumping up onto the bed, but now with these steps and after a few days of bribing him with treats, he uses it all the time.  My other dog who can easily jump up onto my bed also now uses it too.