Oh no! That's no fun at all... I have to keep mine on probiotics with each meal... it floods their system with the good bacterias needed for proper digestion and elimination, and keeps the bad bacterias from taking up residence, especially important if they've been on antibiotics for anything.
Mine used to come down with diarrhea almost everytime it rained. We have a bit of a drainage problem in the yard and it can take a few days to dry up after a good rain. And always in the spring they'd go through it.
So far, like 3 years now, the probiotics have had it under control... no vet visits or medication to treat it. I use this:
Nature's Farmacy - Store - Product Details=
I read somewhere that giving your dog Probiotics is the one best thing you can do for them.