Here is a good website full of information about all dog food brands. All of the foods are rated from one star to five star, and the ingredients are analyzed with pros and cons listed.
Here is a link to the food that your dog is on
it is listed as a 2-star food and it says that there is insufficient meat content, and that it contains low quality grain and controversial fillers (eg; beet pulp)
maybe you should just switch dog foods?