dental surgery on cat - when should last eat before
General Guidelines. Your veterinarian should tell you how long your cat needs to fast before surgery, but there are some general guidelines. For cats younger than 4 months old, withhold food should be withheld starting about four hours before the spay surgery. Cats older than 4 months old should not eat overnight before surgery.Some veterinarians will recommend removing food at midnight, others recommend 9 p.m., and others will advise you to restrict food whenever you go to bed. Many times the difference in times depends on the time surgery is scheduled.ats older than 4 months old should not eat overnight before surgery. Some veterinarians will recommend removing food at midnight, others recommend 9 p.m., and others will advise you to restrict food whenever you go to bed.