Yes, my dog always got sick as well. I changed it so often he stopped eating altogether. They recommend you mix in the old food with the new until he only eats the new one.
Try not to switch his food to often it could be fatal.
Everyone does. Dogs have a very sensitive digestive system. Choose a good quality food (Blue Buffalo, Castor & Pollux, AvoDerm, Pinnacle, Halo, Dogswell, Solid Gold, Wellness, Taste of the Wild) and stick with it.
Make the change gradually.
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