This ramp works perfectly for my 13 year old Chihuahua. He was unable to go through the doggie door on his own, as the drop outside was too low for him. Consequently, there would be "accidents" in the house. If I put him outside he couldn't jump back up through the door as it was too high. This ramp is the perfect height, now he can go in and out with ease, and I don't have to clean up messes! I also like that it's heavy enough that even our larger dog doesn't move it out of place as she goes in and out.