Glad we ordered this pet stairway; lightweight but sturdy (the 4yr old neice also tried it out & it didn't bend or wobble) & I can easily fold it if I want to store it.  The aging pomeranian w/ an arthritic knee used it w/out problem (we bribed her w/ some nice treats) ~ but she isn't using it on her own yet (she still prefers to jump up onto the bed).

Pros: Price, sturdy, portable, scrubbable