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  I'm not great with training but with sep. anxiety, the desensitizing thing is the best way to start.  Since it didn't work, I have no advice.
 However, if this was my pup, I would go back to the vet immediately to recheck the urine.  It shouldn't cost $300 for a UTI though.  It sounds like the vet sent the urine for culture which is fine but maybe just start with a urinalysis this time?  Unfortunately, urinary problems/frequent UTIs/stones are common in Yorkies and can be related to liver problems.  Your vet may want to check for stones.
 
				__________________  Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶  |