I decided that I would change August's food since he had started to show little interest in it.
Mistake 1 puppies go through growth spurts the amount of food the need and desires changes dramatical if you change food every time the dog shows a lack of interest you end up with a picky eater because you have taught him ignore the food and you get something better.
Fromms is such a much better food
The only real jusge of quality is how the dog does on it not some magical ingredient list or recoomendation etc. My dogs have never tollerate welleness a highly ranked dog food does make wellness bad just bad for my dogs that will happen with other foods and other dogs,.
I've been mixing some of the Puppy Chow with the Fromm's as half/half as I can get it to try to prevent upset stomach
the reason you get stomach upset from switching food is quite simple. When you feed the same thing over and over the flora and fuana in the gut become specialized and optomized to digest that particular food combination the more raddicallty different the new food is from the old the harder time the dog is going to have to adjusting. However if you regualar change foods often the flora and funa in the gut remain more diverse and can handle a change with causign an upset.
In such a case as yours a 50/50 mix is too radical the rule of thumb is 1/8 to 7/8 add an 1/8 to the new food and removing an 1/8 of the old every week it takes two months to complete the change on a practical note when you get past the 50/50 mark it is general safe to go 100% with the new after that,
Try adding some pumpkin or natural yogurt
pumpkin incease fiber sometime too much fiber is the problem in the first place the answar is not allway more fiber. and for the yuogurt make sure it has live culture. Paturized yougurt is useless in reguating the gut.