My pups have only been on Nutro for less than a week and Winchester teeth look like some tater bulid up has gone away and Lou Lou doesn't seem to be itching as much. They have been eating it up at meal time so they must like it too! If I knew that switching them would make such a difference in short period of time, I would of switched them. Can't wait to see if the shedding decreases too. The store said I should notice a differece in about 3 weeks. I think I am going to figure out where to get Winchester a good raw bone to chew on to help with the tater build up. If I hadn't come across this board I would of never switched them off Purina dog food. Thanks everyone!