Hi, we have a lovely golden, Buddy, whose 7. He's been with us since birth, he's in good shape (and looks very young), and he has been blessed with good health and happiness, until now. It's been just over a week that Buddy:
1) Won't eat his dog food at all.
2) Won't eat this favorite dog biscuit at all.
3) He hasn't lost all his appetite because he still waits expectantly for human food when we have dinner etc. We don't give him human food (other than a small bite once in a while).
4) He started drinking considerably more water than before, peeing a lot more often too. He just wants to drink water all the time. As a result he has peed in the house and in his crate a few times, something he did not do before.
5) He hardly poops since this began, but when he does the quality seems "normal". Seems contradictory.
6) He looks sad and lethargic, and although he seems to have perked up just a little in the past day or so, he doesn't "smile" like before when we play with him.
All this just started out of the blue. We took Buddy to the vet last week. His physical was ok. They also performed blood work and urine analysis. The blood work showed negative for diabetes

but showed a slightly low white cell count. A second test reconfirmed this result. The vet has now recommended us to do x-rays and see a specialist.
This is taking longer than we'd like. In the meantime though, does anyone have any ideas as to what might be happening here or things we should look out for? How long can a dog go without eating and is he compensating the lack of food by drinking so much? Should we limit his water intake?
Thanks in advance.