Blood in Urine

[Tricolor]

Doc,

I'm not expecting any "miracle diagnosis" here, but wanted your opinion before going to the vet.
We took our 6-year old male out running for bunnies the other day (Friday.) It wasn't too hot out, but it was his first time out in a couple of weeks.
After returning home, he seemed very lethargic (which we attributed to his not being run in a while.) This is very unusual for him, he's usually a very "lovey" dog who will not leave you alone. However, he spent most of the rest of the day in the pen's dog house.
Today is Sunday, and he has not eaten much of anything since Friday morning.
He seems to be drinking more water than usual, and urinating (or trying to) more frequently. This morning I noticed some blood in his urine.
I'm pretty sure he didn't get into any chemicals in the field; we run in an enclosed area, and there aren't any machines there.
Any thoughts before I take him to the vet? Any particular questions I should be asking him when I go?
Thanks,
Tricolor

[Doc S]

Request and expect to pay for a urinalysis, blood count, full chem profile, and heartworm test. Doing any less would be foolish. I would worry about kidneys, bladder, heart, etc.