@Ron S,
Any time you change your dogs food it is going to affect the way your dogs digestive system works. Once the dog is use to eating the new dog food the issues will go away. It is like a human, when we change our diet our digestive is affected for a short period of time then we get use to the food we are eating. It is just quicker in a dog that they will notice the difference. That is the simple reason your dog got sick from the new food. It usually takes about a week for the dog to get use to the new food.
