Your dog's diarrhea may go away independently, mainly caused by a minor dietary change or stress. However, it's essential to keep an eye on your dog and monitor their symptoms in case diarrhea persists or worsens. If diarrhea does not improve within 24-48 hours, it is best to take your dog to the vet for a checkup. Your vet can help diagnose the cause of diarrhea and provide treatment options to get your pup feeling better. They can also advise you on any dietary changes that might be necessary to prevent future episodes of diarrhea.