Thanks for the info, Chris. Barkley has been getting increasingly aggressive with our girls, especially Pixie, who of course is smaller and much less dominant to start with. He has these "spells" when he will just run barking and biting at them for no reason. Tonight, having printed out your post for The Husband's review, we were ready and used the holding him down technique. It's the first time EVER he was quiet and didn't pitch a fit. Your friend is a genius. I am resolved to be consistent with this and see if we can get him over it. THANK YOU!! And congrats again on Jax!!! That is soooo cool. You'll have to let me know how an even quartet works out!