When my Pointer Simon had kidney issues (urine wouldn't concentrate), our vet put him on Hill's Prescription Diet c/d. Please make an appointment with your regular vet immediately and take those blood results with you. Your vet will likely recommend further testing, and possibly a special diet they can sell directly from their office, which I highly suggest you use. Normally I'm a huge fan of going with higher quality kibble or home cooked, but during my search for (IMO) a better quality than Hill's for Simon, I came up with next to nothing. He recovered quite nicely, though he wasn't in a failure state, and I suspect that by following your regular vet's advice, your pup will be ok. Good luck, please post back when you find out from your regular vet what's going on and what your course of action needs to be.