For creaky pets, a plastic framework covered in stretchy nylon top (removable for washing). Plastic frame can be broken down for flat packing.
The steps have been a great help to our (now ancient) Border Collie but she is now unfortunately past such and insists on being lifted up & down.
I don't recall the exact weight rating for the steps but they came from Amazon and should still be available. Our Collie is 15kg.
Usual caveat, due to the number of numpties who seem to think "gizzit" is a sufficient response; include a contact number, please. No number, no offer.
Dog Steps (Gayton CH60)
This offer has been gifted to someone and is no longer available.