It is necessary to protect the health of the dog's joints or the legs of the old dog. You can use pet stairs or slopes to help improve housing conditions Inconvenience caused by height. However, pets have different needs for stairs, and the height, width, and material of stairs suitable for each type and body shape are also different.
https://petsthing.com.hk/en/blogs/news/how-to-choose-dog-stair-slope-in-hk