Our 80 pound Lab was born with a defect that has required surgery on both her hind legs and now she has extreme arthritis in her knees.  Getting up on the sofa or our bed (she is after all part of our family) was difficult for her and getting in and out of my car almost impossible.  She did not hesitate to use these steps and I'm sure i saw a big smile on her face as she easily got into the car to go on a ride with us up to the mountains.  the steps are light enough to easily move from place to place and stow easily in the way back of my car for road trips.  I highly recommend these steps.