Oscar ONLY barks when he hears things - he's been doing it more often at night when he hears a noise - just lets out one loud bark - enough to scare the crap out of me - then sits and listens. I'm lucky I guess because he doesn't continuously bark and yap at anything - just one bark, that's it. I'm a little surprised actually - I thought Ruthie was going to be the barker but she's super quiet - since I brought her home, Oscar has started doing this barking (never used to at ALL). Maybe he's trying to protect his girls...