They don’t knock over and are still very light. My dogs run all over them. The steps are slightly smaller than I was anticipating... my dogs are on the larger side of small and they skip steps. Took my shitzu a minutes to get used to themsee them properly, but he’s a pro at it now. My bed height is 17” with the mattress and they are a little short on the height-side , but my dogs still manage them fine. They match our room perfectly!