Bentley is almost 14 months old now and he hardly ever does it anymore. He never did really do it bad. We would just scold him sternly when he did do it when he was smaller and he'd quit. He hates to be scolded. I can't remember the last time I saw him do it, except for Lassie, and that is controlable cause we keep Lassie in the closet. I only saw Bitsy do it when she was in heat. I guess she was trying to use "role reversal" psychology because Bentley didn't know what to do