Well thank you for the info..
He was on Royal Canine Yorkshire Terrier
But, the vet switched him to the Royal Canine Urinary S.O.
I am not feeding him anything else other than the food and of course lots of fresh water. I think I might need to get another vet involved if I do not get answers soon. I am so worried...and running so low on funds to make him feel better.
thank you again.