If your feeding the animal anything with byproducts (Eukanuba, Iams, etc - all the mainstream commercial brands contain harmful ingredients) it's not going to be good for them, most dogs will have an alergen to these products because they contain grains as well.
Ramsey, feeding your dog Healthwise is going to be above most standards. They use oatmeal for their grain substitution which has a lot less likelyhood of causing alergic reactions in your animal. If you want to really treat the animal to some of the best diets by going grain free a switch to Evo or Innova would be wise - these foods are higher in pricing but require much less serving size because of their grainless ingredients and high protein content.
For dogs that are unable to stomach high protein foods but experience alergic reactions to grains and fillers (most commonly corn) a switch to Natural Balance or California Natural would be the next best choice. California Natural is going to be mostly for sensitive animals, it contains the most basic ingredient list on the market which consists of nearly 100% white rice and chicken. Natural Balance uses sweet potato or brown rice as a substitute grain which is much more digestable for a dog.
Those are among some of the top foods but others like Merrick, Ziwi Peak, Wellness, and Primal are also great foods.
I'm not stating any of you are doing anything wrong by feeding differently I'm just stating it is healthy for your animal to eat good ingredients. Some dogs very well can eat the cheaper foods and not have an alergen and live a healthy life. I could probably start drinking a six pack every morning I get up to wash down a package of bacon and smoke a box of cigars a week and live a good ninety year life as I do so. The point is - I would feel better eating well and taking care of myself.
Ignore Ben and his post