However, while the true number of reactions is unknown, veterinary specialists estimate that 1 - 6 % of all dogs and cats have allergic food reactions. (compassionatecareveterinaryhospital.com)
So the hard part about avoiding allergic foods is trying to figure out what is actually in the foods that you are thinking about feeding to your allergic child. (verywellfamily.com)
In Germany, chicken eggs, cow's milk, and peanuts are the most common causes of allergic food reactions in children. (sciencedaily.com)