My little 15 lb dog is almost 15 years old.  She could jump up on the bed and back down w/o a problem until I replaced my mattress w/o thinking and now it's 6" higher.  The bedside ramp is the perfect height to get her up there but it's going to take some repeated encouragement.  She can walk up and down w/o a problem and no slipping.  I wish I had bought it a few years ago so her joints wouldn't have been jeopardized by the jumping down process.