you dont have to throw the food or treat; pet store usually will take them back and exchange them for something else; where did you get the food; if you have the receipt they will refund them; just say it's not agreeing with your dog.
propac is horrible it has corn; no good for the stomach; you need to switch food asap; dont get anything with corn or by products;
try natural balance small breed duck and potato. or halo puppy wild salmon;
also return the nutro treats and get natural balance treat or
Buddy Biscuits Veggie Madness Dog Treats