the vet said no food or drink after 8 pm the night before surgery, and its is 24 hours since at this point and they have said NO food or drink until morning ( another 7 hours away, which makes it a total of 31 ours with no food or water!!!!)...and I understand about the food ( that it might make him vomit) but i do NOT understand why no water? He is so incredibly thirsty its making me so sad. I just wish I could give him water, but don't want to harm him since the vet stated not to..
any suggestions and/or anyone that know why he cant have water post op?

Thank you!

he is a 4 1/2 month male puppy