We got the 6 foot tri fold steps from Chewy. Our dogs don't have any health issues that prevent them from climbing but we were concerned that our small dog would hurt her back legs having to go in and out. She had both ACL's repaired a few years ago. We were afraid our large do would mistakenly slip out the back of the steps while going up them resulting in possibly a broken leg. It works great and while wide enough for our 90 lb dog it is narrow enough that it gives the DW and I enough room to go in and out on the side next to the hand rail.