Having a dog with environmental allergies is always a challenge. If you’re human, often you can treat yourself with antihistamines and decongestants – dogs don’t generally have that luxury. The good news is there are several natural foods you can add to your dog’s diet that will give them Quercetin. Quercetin is a naturally occurring bioflavonoid found in many plants. It has antihistamine and antioxidant properties that can help your pet deal with itchy skin and other allergy reactions. Find a complete list of those foods in this informative article.