I would stay very far from purina they are the owners of waggin train chicken jerky that has killed many many dogs and made even more very sick and they don't care enough about pets to pull the treats and figure out what is wrong with them. I can't imagine what they might be doing to there food to save money. Always check any treat before you buy it and don't risk it if it says made in china. It is to long of a list to post what treats are bad. This website
Dog Food Reviews and Ratings | Dog Food Advisor is a good start but after picking a food you like it is very important to research the company.