I don't know why Bella barks. She doesn't really bark when someone knocks on the door or when she sees people out the window. She barks when I'm on the phone, when my roommate walks into my room. She has a play pen in my room and she barks (rather vicious sounding) when my roommate puts her back in it. I don't know what to do and it's getting progressively worse as time goes on. I'm willing to pay for an in house trainer if anyone has suggestions. I live in central Orange County, CA. Any help is appreciated!