Many of the anaesthetic drugs we use have an impact on the gastrointestinal tract. Many animals can take up to 72 hours after anaesthetic to pass stool, especially if they have had opiate medication prescribed. Many animals will not eat dinner the night of their procedure, or if they do, their appetite may be impaired. It’s also possible that the might feel nauseated and may vomit if given a large meal, particularly if their procedure ran late. We recommend feeding a small amount of food when you get your pet home. If they keep that down and still seem hungry, try feeding the rest of a normal meal 30-60 minutes later.