Go to You Tube and type in "liver shunt in a yorkie named Ginger".  I don't want to scare you but your yorkie is showing some of the same symptoms as Ginger.  Not as severe which is good. Make sure your vet tests for liver shunt go rule it out.  Good Luck!     
				__________________  Bogey   Maggie Mae   and Barkley 8/28/12        |