We had a greyhound once that very rarely drank water out of his bowl and when he did it was literally only one or two laps. We tried him with bottled water instead, in case he didn't like the taste of tap water, but that didn't make any difference. We mentioned it to our vet but he said it wasn't really a problem as long as he was eating. In the end I just added more water to his food and fed him three meals a day to make sure he was getting enough.