I agree Morena. It was easy to spot the offender because she was the only one with her whiskers left. She's not a very nice mouse and wants to bite me when I take her out of the cage so I wouldn't want to make more of her

I have also heard that the behavior can be learned as well as genetic but so far none of the other does are like her. The whiskers are growing back nicely and they seem happier with the barber not around.