Obviously we are trying to stop her biting by putting her in another room.
When she chases her toys or plays catch in the garden she growls. I must admit that it is a bit DH's fault as he plays with her and gets her all excited. I just caught DD growling back at her and she said that papa does that.
Should we be discouraging her? She is lighter than a bag of sugar so I am not worried about her hurting anyone but is this making her more aggressive?