Hypoallergenic cat foods avoid common allergens like soy, dairy or wheat, which can cause skin issues and digestive upset in some animals. The symptoms of allergies and intolerances are similar; however, while allergies involve the immune system, food intolerances revolve around the digestive system. This is why hypoallergenic cat foods use easy-to-digest and limited ingredients to reduce the risk of unpleasant reactions. Popular hypoallergenic options for cats include Royal Canin Hypoallergenic cat food and Purina hypoallergenic cat food. However, always consult with your vet for the correct treatment and diagnosis.