How can I make a set of doggy stairs for an elderly dog?

http://build-basic.com/build-diy-pet-steps/

https://www.instructables.com/id/Scrap-Wood-Dog-Stairs/

https://dogsaholic.com/lifestyle/how-to-build-dog-stairs.html

https://www.google.com/search?q=diy+dog+stairs+plans&tbm=isch&source=hp&sa=X&ved=2ahUKEwjQ4O2Kv_jiAhUII6wKHXpABeYQsAR6BAgCEAE&biw=1093&bih=499

What about this?

https://youtu.be/dIep1W6nAnk

Or a ramp might be easier?

https://youtu.be/gecSY1rzKig

https://www.k9ofmine.com/diy-dog-ramp/

https://www.youtube.com/watch?v=2DhamMzo3WI

you can also buy the stairs for $10 and up online by googling or go to amazon.com

a ramp will be better for going down so she doesn't jar her knee here are several videos on both ramps and stairs https://www.youtube.com/results?search_query=diy+dog+steps+and+ramps stairs https://www.youtube.com/results?search_query=diy+dog+steps ramps https://www.youtube.com/results?search_query=diy+dog+ramps I have 3 dogs ranging from 5lbs to 75lbs and use childrens step stools or very small/short footstools(old antique) depending on what furniture they are getting up on. also glued anti slip rubber onto feet bottoms of footstools to keep from sliding as dog pushes off/kicks while going up or down.my lrg 75 lb dog had both ACL torn & surgery so I got a ramp for her to get in & out of my truck

Thank you Lynn for the great info