I have now started feeding Chicken Soup (after finding the error of my ways, thanks to this site) I am introducing it gradually. I also heard that it is a good idea to to change kibble for taste reasons. I plan on feeding Wellness or some other premium brand after the Chicken Soup. I know that I have to introduce these slowly into thier diet. My question is once they have had a particular dog food (I am talking down the road in years) and there system is adjusted, do I have to introduce it again or can I just feed away? Just wondered.. Thanks