Last specific gravity was 0.010. Admittedly that was at least a year ago at a different vet and if it has been measured since, my new vet hasn't mentioned it. I am very certain it has not improved though and if anything is even lower. This is something we'll check next week for sure though. BUN and Creatinine done in September 2013 prior to a dental cleaning were normal but I don't have values. A previous vet (the one who did the specific gravity) did say he likely had early kidney failure that wasn't showing on the blood work since thyroid was fine and Cushings was negative. This current vet hasn't even mentioned kidney failure and focused on his back pain after ruling out a UTI. I thought she had the records from the previous vet but it is possible she doesn't. I don't know what they sent her.