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If your dog has not had a fecal exam, you need to see the vet for one to rule out a parasite problem.
If you suspect that the dog may have GI upset because he ate trash or another product that might cause diarrhea, you can feed a bland diet of NOTHING BUT boiled chicken and white rice (no bones/no skin). If it's GI upset, this will help. If it is one of the things mentioned above, it will not.
Let me know if you still have questions.