If your dog has diarrhea all you have to do is boil some rice, then drain the water out of the rice and pour it into a bowl, let it cool and give it to your dog to drink, the starches in the rice water have a binding effect and will cure the diarrhea and give your doggie some relief.
Also if your dog has diarrhea make sure it has plenty of water so it does not become dehydrated.