it's best to transition to a new food slowly so the dog doesn't get runny poop. one thing you can try to do is add water to the orijen food and heat it up a little in the microwave, then crush the food and make it into a paste and mix that with the old wellness food. that way it will smell kind of like the new orijen food, and your baby might be willing to eat the wellness that way.
hope this helps, good luck!
