OK so Buster is 4 months now.When we got him at 6 weeks I started feeding him the Nutro puppy( purple bag) and he was on it for about two weeks and had the runs really bad so I stopped and put him on IAMS ( yes I know all about the IAMS) but the Nutro was to rich for his belly at the time.I still have half a bag left of the Nutro Max and am low on the IAMS which means I will be heading to the pet store tonight but my question is do you think his belly is able to handle the Nurto yet? I want to get him on good food and his coat is a LITTLE corse so I no he needs to be changed over but I dont want him having the runs.Does the Nutro have more of something in there that would cause him the runs? Should I just try something different altogether? If I go with a new food should I also grab a bag of the IAMS to mix with teh new cause I dont have much left in the bag of IAMS?Any advice would be great and thanks in advance!!!