I bought this for my two chihuahuas that can’t jump up onto our bed. They are both really picky and I was worried they wouldn’t use these stairs. It took a little less than a week before they got the hang of using it to get and and off the bed. 
These are so sturdy I think it really helps them feel safe. 
My one chi gets so excited when I come home now that he runs up and down the stairs about three times just showing his overall enthusiasm! 
I want to purchase the shorter ones for our couch now!