Our guinea pig pups were hesitant to use the ramp at first. They were slow and cautious, but as soon as we added the fleece liners (sold on Guinea Pig Market) to the ramp they became daredevil racers, zooming up and down the ramp! If you have a piggy who is interested in the ramp, but hesitant, definitely consider adding the fleece covers. We were shocked by the difference! It isn't that expensive either.