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A prescription isrequired for these products. Click here for details Canine z/d® ULTRA Allergen-Free is for the Nutritional Management of Dogs with Food Allergy and Intolerance. Food allergy and intolerance can be mild to severe and may include painful problems with the skin, ears and digestive tract. These responses, also known as adverse reactions to food, are ususally a response to protein in the food. Prescription Diet® Canine z/d® ULTRA Allergen Free is designed by veterinarians for the diagnosis and nutritional management of food allergy and food intolerance in dogs. Only Prescription Diet® z/d® is formulated with Hill?s Hydrolyzed Protein System?, a process that breaks down intact animal proteins and virtually eliminates the possibility of an adverse reaction to food. Most reactions occur because of an allergy to beef, dairy products or wheat. Canine z/d® ULTRA Allergen Free contains none of these allergens. This product is considered the "Gold Standard" by veterinarians at Hill?s to provide the ultimate food in eliminating the chance of adverse food reactions or allergies in dogs. The price is worth the confidence you will have in providing your pet relief. The nutritional formulation of Prescription Diet® z/d® Ultra Allergen Free may also be useful for pets with a variety of conditions. More Info All food is shipped ground delivery. Please allow 7 to 12 days for your delivery to arrive. Please note, we do not ship pet food internationally. For more shipping info click here.