What dog food to choose?

Question
I have a 5 week old huskie/malamute and a 12 week old german sheppard/malamute. We have been doing the process of changing their food from iams to buffalo blue. They both have very runny stools and wait to get into the house to do it. We are wondering what we can do to help the stool change? Your advice is greatly appericated.

Answer
If they were doing OK on the Iams, go back to it. There isn't a single bit of factual evidence that premium foods such as Blue Buffalo are better than Iams and other common brands.  The service dog schools provide abundant evidence that dogs thrive on Iams and similar brands.  I have a 9 month old Golden eating adult Iams,and he is doing great.  We were at a show today and people were saying we should be showing him.  

Out of 19 puppies we have raised for service dog schools, every one of them had nice firm stools on Iams or other common brands.