The girls are chihuahuas and yes they bark quite a bit. Delilah barks alot. She is more of the classic "yapper" type of barker. Daisy didn't bark until she was about 2 1/2 and she still doesn't bark as much as her sister but when she sees something out the window, look out At 5+ pounds she has a deep, throaty bark that's so funny. She sounds more like a big dog and she really acts like she's in charge of the whole situation.