When a dog has diarrhea, whether it is necessary to eat or drink food or drink depends on the specific situation. Generally speaking, dogs can fast for a period of time when they have diarrhea, such as half a day to a day, to reduce gastrointestinal pressure. However, water deprivation is generally not recommended because the dog may lose a large amount of water during the diarrhea process, and water deprivation may cause the dog to become dehydrated.

During the fasting period, you need to closely monitor the dog's condition and ensure that it has sufficient Drinking water supply. If your dog shows symptoms of dehydration, such as poor skin elasticity, sunken eyeballs, etc., you should seek medical attention promptly.