Nice and wide/deep which is why I purchased this to give my arthiritic aging cat an easier way up and down to my bed. 
Only 3 stars because I don't like (or rather my cat doesn't like) the slight angle each stair has, which you can't see. I think it makes it harder to get down having to brace for the angle with arthritis. 
And I think the height of each stair is a little too tall for an aging cat (or perhaps small dog). 
But overall, the larger width and depth of each stair is worth it, giving my cat more security going up and down. 
I would recommend with noting the angled stairs.