Purina Puppy Chow Dry Food is my first choice with a new puppy.  It is recommended by my vet.  It also was less likely to cause loose stools than other brands that I have tried in the past.  It also was less expensive and more readily available at multiple stores than a lot of other brands.  I was given Eukanuba by the breeder with my last dog and noticed that her stools were very loose, even runny.  I tried Iams with no different results.  When I spoke with my vet, her suggested Purina puppy chow because it is a good product and is also a lot less expensive than the other national brands. ...