Here's the last thread I remember with this problem:
http://www.yorkietalk.com/forums/showthread.php?t=43263
and the followup confirming she had a really, really bad infection:
http://www.yorkietalk.com/forums/showthread.php?t=43285
They usually drink a lot of water, squat to pee more than once, urinate frequently, lethargic, etc., licking, sometimes blood in their urine.