This is going to be hard ...
Because yorkies were born to be ratters so they look for quick rapid motion and small animals when they hunt
so you're dealing with instinctual behavior here
How you break this habit is bring your dog into a room with you and the bird
If he's quiet and good treat him
but if he barks or jumps .... out he goes
once he calms down you can try again and this is repeated again and again until you see improvemnt
__________________ Mike  and Zach's  Dadd |