You didn't say if you just got her recently or if you've had her for awhile. I have several questions for you. If you've had her for awhile, is this something she just started? Did you already have the other dog before she started this behavior? Has the other dog gotten extra attention lately for any reason or has there been any kind of a big change in your home? Maybe you could try putting dog booties on her and distracting her with a toy when she tries to bite herself. Kongs keep my dogs occupied for quite awhile. One of my dogs used to bite her paws a lot (though she never made them bleed) and I used the above methods and she finally quit. Hope this helps.