How long should a dog with vomiting and diarrhea be fasted from food and water?

A dog with diarrhea and vomiting should be fasted from food and water for about 12 to 24 hours, depending on its condition. Many causes exist; if unsure, see a vet or consult one for targeted treatment to relieve symptoms.

For severe diarrhea and vomiting, also give antidiarrheal and antiemetic medication, then take the dog to a hospital for IV fluids to prevent dehydration.