My dog will not drink water

How long has it been since your dog drank, what type of dog do you have, and how old is your dog? Did you try tap water, or spring water, is the water bowl clean, some dogs won't drink standing water, how long have you had your dog?
Sorry for asking so many questions but your question was a bit vague, let me know the answers to my questions, and maybe I can help.

Short and sweet... call your vet asap!