Pietruszka is *very* scared. She easily climbed those stairs outside a neighbours' house, but the only stairs she knows and has ever walked, at our house, have different parameters, such as step rise, tread depth, and so on. This is the moment she realized she's not in Kansas anymore.
@SwellWines We live in a tiny house with very steep stairs and all the dogs learned to use them, although some had serious problems at first. Most of them never used any other stairs – though we can't be sure what lives two of our rescue dogs dogs had before they came to us. Two of them had known those stairs from birth (on of the rescue dogs was pregnant when we took her in).