Excellent post Curly!

I agree it probably is just dehydration... but it could be an indication of blood in the urine... maybe a kidney problem. Does he have any discomfort? Does he even feel "hot" around the kidneys?

Another way of getting fluids into a relucatant person is to offer broth.... clear chicken soup is great when you are sick. A nice big bowl. He really needs to deal with the ongoing dehydration... tell him it's like driving a car with an empty or near empty water tank.... guys often respond well to car analogies... LOL