One of the most common ways to treat a dog with diarrhea is to give it plenty of clean water and avoid feeding it for the first 12 to 24 hours, as stated by WebMD. Since there are numerous causes of diarrhea in dogs, it is important to have the dog checked out by a veterinarian for a proper treatment plan if the diarrhea persists.
If the dog's diarrhea lasts longer than one day and if the dog experiences other symptoms like vomiting, lethargy, dark or bloody stools and decreased appetite, the dog should be taken to the veterinarian as soon as possible. Some of the most common causes of diarrhea in dogs are changes in the diet, stress, food intolerance, inflammatory bowel disease, cancer or ingestion of a foreign item or spoiled food. Besides diarrhea, dogs may also exhibit other symptoms including flatulence, straining to produce a bowel movement or mucus in their stools. Diarrhea in a puppy can be an indication that it has a serious illness, so it is necessary to bring the puppy in for an examination.
Diarrhea that lasts only a day is usually not a sign of a serious illness. Any time a dog has diarrhea that lasts longer than a day, it can cause dehydration and could be an indication that there is an underlying health condition in the dog.