how long do dogs need to be without food before an operation
Confidence votes 22. Most vets will tell you not to put food down the night before they go in. It's about the same as a person when they go for surgery. Usually 12 hours before. Any food in your system and the anestetics could make you sick.Usually people stop feeding their dogs at around 9pm or 10pm but still allow them to drink water.sually 12 hours before. Any food in your system and the anestetics could make you sick. Usually people stop feeding their dogs at around 9pm or 10pm but still allow them to drink water.