Just received these pet stairs and already our   12 y.o. Jack Russell figured them out.  Her favorite hobby is sunbathing in our windowseat, but jumping down from the window just isnt safe for her anymore especially with us having wood floors.  For the short term I had a really thick dog bed for her to jump down to, but it it wasnt a perfect solution.   These stairs appear well made,  the foam is quite dense.  Thank you to the other reviewers who mentioned that this product works for their large dogs, as it helped inform my decision.