My cbr Roo is a little over 10 weeks. She will retrieve bumpers not necessarily to hand (I usually have to cut her off. I started with a glove and she is crazy about it. At this point she'll jump into my lap at a full sprint with it. The problem I have is she drops it mid air right before contact and tries to take a chunk out of my arm. How do I keep that enthusiasm and curb the biting.