Woody did that too!!
He'll be ok, unless he is alergic to any of the ingredients.
Give him a few pieces of bread. That's what my Vet told me to do for Woody.
He did get a stomache but he was fine.
In the future, if you think he ate poison 1 tablespoon of Hydogen Peroxide will make him puck out everything he ate. Sometimes you have to give a second dose 20 minutes later.