We got this ramp when our dachshund got too old to handle the stairs to our back door. The concept is great, the non-slippery texture is just right -- but the little guy had to be put on the ramp almost every time. 

Now our next-door neighbor is trying to use it for her aging mid-size dog. Her dog is smarter than ours (sorry, Fritz) but she, too, resists using the ramp. Maybe the dog needs to get acclimated when younger. You know what they say about old dogs and new tricks.