Here is a comparison to the SD and what the ingredients are:
COMPARISON
There is also a great video to watch that will tell you about the ingredients that is in most commercial dog foods:
VIDEO
In summary..Corn has no nutritional value and is used as a cheap filler. it also causes allergies
Wheat and Soy are also known allergens
By-products are the parts of animals that are not fit for consumption..these include the beaks, feather and feet from chickens, meat can be the rendered animals from vets including diseased and euthinized pets, maggot infested beef that isn't used for anything else. Overall, by-products of any kind aren't healthy or nutritious.
Just read labels on everything that you are feeding your babies...they have no choice but what we feed them and it is our responsibility to give them the best food/treats we can.
Hope that helps!!