Hi and welcome to PT. My name is Terry and I live with two chihuahuas, Daisy and Delilah(pictured below). I absolutely love your crew. You must be in heaven living with so many cutie patootie chihuahuas. I've never owned a chi that was/is a biter so I can't offer any advice. Sorry, I can't help but I wish you luck. I hope we get to hear and see alot more from you and your adorable little family