Had purchase HappyDog NaturCroq Welper since my dog with DOB 12/12/2014. Found out the ingredient included wheat, is wheat as bad as corn??

The ingredient is as below:
Poultry meal , wheat flour, corn flour , greaves , rice flour , whole grain corn , poultry fat , beef fat , fish meal , hydrolysed liver , sugar beet molasses , meat meal, apple pomace ( dried ) ( 0.8 % ) , yeast ( dried ) , malt sprouts , sodium chloride , green oats ( dried ) , sunflowers ( dried ) , cress ( dried ) , parsley ( dried ) , ( Green Herb total: 0.3 % ) digestible energy : 1690 KJ / 100g ; 4050 Kcal / kg