I have never seen Pepper binky and I have only seen Humpty do it a few times in the first week or so I had him. They seem really happy and healthy :? I guess it would be hard inside because of the wood floor being a bit slippery, but they don't even do it when there's carpet down or when they are in the run outside Is it because they are big and need a lot more space to get a run up ??? or are they just too lazy?