One of the most effective home remedies in treating dog diarrhea is allowing the gastrointestinal tract of the dog to rest. This would involve withholding food for the dog for up to 24 hours. Instead, you should encourage the dog to drink as much water as possible. If the diarrhea is persistent and shows no signs of slowing down, you need to consider giving the dog a supplemental electrolyte solution. Some of these solutions are available over the counter in grocery stores and pharmacies. Dilute this solution and mix it to the dog’s water drinking bowl. There are also custom electrolyte solutions and sport drinks out there that you can use.