My 10 year old cat had surgery for a torn ligament on her back leg, and found it hard to jump up on the bed.  I just got and assembled this cat tower, and she walks right up it with ease to the top of the bed.  Now I don't even feel her jumping on the bed anymore... she just appears at the top.  She goes down just the same.... she and I both love it!  Very easy to assemble and with the carpet, it is very soft on her feet.  Steps are big and deep enough for her to get up with no problem!  I would recommend this product for small dogs, and all cats who are both healthy or aging and arthritic.  You will not be disappointed!!! (If they do not use it at first, try putting a treat at the top to get them use to climbing up it).  I did not have to do that.