Great solution for aging/injured dogs. The ramp is assembled, pulls easily out of the box and is ready to use. My dog was hesitant at first- she is injured and was tentative about climbing it. My son demonstrated and she followed him up. It is good to have a second person to hold the top steady. The safety catch has a bit of a long string which allows for some potential slippage. Otherwise, perched safely on the tailgate of my van, enabled my 85lb golden to easily climb into the car.