Several commercial dog diets claim to support normal immune system function, but scientific evidence is limited. This literature review summarized scientific studies on the in vivo effects of vitamins, minerals and plant-based compounds (phytonutrients) on the immune responses of canines.
Canine health is influenced by diet and GI microbiome, which plays a key role in nutrient digestion and absorption. Pet diets have been modified to include functional foods that target microbiome or provide essential nutrients.
10 best dog food options for autoimmune disease reviewed and rated. Here is some homemade dog food to boost your dog's immune system.

This literature review aimed to better understand the current knowledge on the effects of vitamins, minerals and phytonutrients on dogs immune function.
Immune Harmony contains high potency plant sterols for dogs and cats. Our patented blend of antioxidants and beta sitosterol is recommended for autoimmune disease, chronic viruses, cancer and allergies in pets.

Some popular brands include Purina Pro Plan, Hill's Science Diet, and Royal Canin. These products are designed to provide balanced nutrition that supports the immune system without causing any adverse side effects.