Allergies don't start right away. They start after repeated exposure to a particular ingredient. Ellie may have recently developed an allergy to corn or chicken or both.
Corn, soy and wheat are the three top allergy causing ingredients in dog foods. Why, oh why, would they put corn in a prescription diet? BTW, Science Diet uses corn, too.
My Lady has food allergies and I have to use "odd" protein sources like venison or duck. I also have to rotate through foods regularly to avoid her developing sensitivities to those, too. |