Is it normal for a four-month-old dog to have diarrhea?

It is not normal for a four-month-old dog to have diarrhea. Diarrhea is often a sign of disease. There are many reasons for dogs to have diarrhea, such as catching cold, eating foreign objects, parasites, serious infectious diseases, etc. Under normal circumstances, owners need to observe the dog's mental state and frequency of diarrhea. If the frequency of diarrhea exceeds 2 times a day, the dog needs to be taken to the hospital for examination and symptomatic treatment.