chewing

I have been pondering this for a while now and would like to get some input. Mandy does things at night while I am sleeping that she doesn't do during the daytime...

I am in love with my german shepherds Kandi and Titan!  Major problem though!  Kandi is the alpha dog and nips at titan 4 being near me.  Titan only chews things at night when everyone is asleep!