I know a lot of people on here are not crazy about using metronidizole, but I keep it on hand for situations like this. It clears up the problem so quickly and I've never had a dog have any reaction to it. I usually only give it for about 3 days, but it's enough to get them back on track. Sometimes it takes Metro to kick that diarrhea in the butt (no pun intended... crazy).
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Kris
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Samson, GSD, 10/13/07
Annabel, Keeshond, 4/21/11
Petie, Toy Poodle, 5/5/07
Kitties: Meezer, Bob, Mia and Dewey