My 8 year old boy Toby was diagnosed in mid June with a reading of 516. Twice his reading has gone down to mid 300s but is usually in the 400s. So, it has never been regulated. Three weeks ago, my vet did a urine test and found that he had a severe UTI. After three weeks of Clavamox, we tested urine again and found that it has gotten worse instead of better. She changed the antibiotic to Baytril and Amoxil, and said we would check again in two weeks. She said that if this antibiotic didn't work that we need to see a specialist. We tried Novolin insulin for about 6 weeks and then switched to ProZinc. He is now on 6 units of ProZinc a day. Does anyone have any experience with UTIs?