[Rescuemomma]

I agree that this sounds more like a liver problem to me - Liver problems can cause an elevated BUN as well. So can dehydration. Where her electrolytes (Sodium (NA), Potassium (K), and Chloride (CL) generally) checked? If so, what where those values? What where her liver values?

Personally, I'd try a liver-friendly diet for a short while. I generally use a mixture of white fish (such as pollock) slowly boiled to retain most of the nutrients, rice, and sweet potato for 2-3 weeks and then retest to see if it's made a difference. NSAIDS can affect either liver or kidney health - So the Deramax could also be causing the elevated BUN. I personally try to avoid them - I have better luck with Gabapentin for arthritis pain, combined with Duralactin (works similar to NSAIDS, but all natural and, in my experience, more effective), Adequan, and Dasuquin + MSM or another high quality joint supplement.