I noticed your signature has GPA Houston in it. We are also in Houston. Shortly after we got our first greyhound, Ian, our vet told me his creatinine was too high and this could be a sign of kidney failure. This was seriously about 2 months after we got him. Anyway, long story short, we have a new vet. Sam Miller at Village Vet 713-468-7955. He is one of the vets GPA Houston recommends. If you want to pm me, you can to make sure we have not had the same bad experience with the same vet. Dr. Miller is great, though!