If your dog has allergies and is allergic to certain dog foods then you might need to try different types and brands of dog food.
But Purina brand of dog foods are usually pretty good for dogs who have allergies.
Purina Pro Plan Veterinary Diets HA Chicken Flavor is a good dog food for dogs with allergies as well as Purina Pro Plan Sensitive Skin and Stomach dog food.
Other good brands of dog foods for dogs with allergies are Merrick Limited Ingredient Diet Real Turkey Recipe, Wellness Simple Limited Ingredient Diet, Merrick Limited Ingredient Diet Salmon and Chickpeas and Acana Singles Duck and Pear Singles Formula.
Chewy.com sells a lot of good dog foods for dogs that have allergies and they are fast with shipping and you can save money by buying dog food through Chewy.com and save the hassle of having to lug the dog food from the store to your house.
I buy my dogs dog food through chewy.com now and I would recommend anyone with pets to buy from chewy.com