Henry has humped his snugglepuppy since we got him (at 9 weeks - 9 weeks ago) - when we catch him we stop him, but it doesn't stop him wanting to do it. He doesn't do it with anything else. I was actually going to post a question asking if there was anything I could do. I just remove snugglepuppy and put it out of reach for a while. Sometimes he does it when he's lying on his back too!