Audrey,I'm so sorry to hear about Butter but I'm glad that you took him to the ER vet tonight. My cat Storm had this 2 times and he had developed scar tissue so they couldn't even catheterize him the 2nd time. He had to have the PU surgery by a board certified surgeon and it was very expensive but worth every penny because he's now a very happy and healthy boy. Now all of my cats except for my kitten Ziggy Stardust are on the Royal Canin Urinary S/O diet and are doing well. I hope that a change in food will be all that it takes to get Butter healthy again. Lots of prayers and positive thoughts are being sent his way.(((HUGS)))