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Diarrhea can be caused by a large number of things including an unusual treat, irritable bowel syndrome, disease, bacteria or protozoan infection. If your dog is eating and drinking normally, Kaopectate at 1 teaspoon per 5 pound every 2 - 6 hours or Imodium at 1 mg per 15 pounds one or two times a day can be given for diarrhea. Read dosage information here that states Loperamide is also dosed at 1 capsule (2 mg) per 50 pounds (25 kg) if over 20 pounds (10 kg).
Some herding breeds like collies can have an adverse reaction to imodium so avoid using in collies and similar herding breeds. Canned pumpkin (not pie filling) will also absorb excess fluid in the bowel with just a spoonful added to the dog’s food. Some experts will recommend a bland diet for a few days of boiled chicken and rice.
If the diarrhea continues, have your dog tested for parasites such as worms or a protozoan infection such as coccidia or giardia. Here are sites on worms, coccidia and giardia, which you may find informative.
Since it has been 5 days, I'd go ahead and get a stool sample into your vet for testing. The weekend is approaching fast and you want to have treatment started before then if possible. You might also deworm your dog if they haven't been dewormed recently. It is one of the most common reasons for diarrhea.
If you changed your dogs food before that, it might be an allergic reaction. If you started with a new treat, etc, that might be to blame. If your dog is an elderly dog, then I'd recommend a quick vet check before the weekend to ensure there is no organ dysfunction.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.