I need to make a cat ladder to go back and forth overa 6 foot kennel fence
https://www.mnn.com/family/pets/stories/cat-tacular-stairs-and-ladders four good ideas here
You are welcome:)
You can use any el cheapo ladder system, but I would put carpet or outdoor carpet on the steps to help assure they won't slip or fall.
here are lots of ideas/videos https://www.youtube.com/results?search_query=DIY+cat+ladders
thank you so much great ideas