Hi Mileymorkie,
Welcome to YorkieTalk. I'm sorry you and your sweetie are dealing with this. Thank you for looking after your little one.
A thread on YorkieTalk from 2010 may be helpful. Started by "my_2_yorkies" the htread . is titled "
urinary problems ..."
In particular, note the several posts by ladyjane in this thread.
Hope this helps.