Also, here's some more info on Pepto and dogs.
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"Contraindications/Warnings
Not for use in patients hypersensitive (allergic) to it or to aspirin products.
Use with caution in animals with bleeding problems like von Willebrand's disease.
Do not use in cats as it contains aspirin.
Not for use in pregnant or nursing animals.
Stool may turn a gray-black or greenish color during treatment. Do not confuse with melena (blood in the stool).
May interfere with reading of abdominal x-rays.
May cause inaccurate results of urine tests.
Shake well before use."
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From this site....
The Use of Bismuth Subsalicylate (Pepto Bismol) in Pets