ottoluv
Posted : 4/23/2007 9:24:43 PM
That's because it's a hypoallergenic food; it is formulated to prevent allergic reactions to foods. It is nutritionally balanced.
I agree with Jessie's mom, The Hillz z/d is made in a way to minimize antigenic stimulation for dogs with severe unidentified food allergies. After you are on it for the two months and the symptoms subside, then you can slowly add back the most common antigens to see if you can identify the source. Regardless of what anyone says or thinks, statistically the most common antigens that cause food allergy are meat protein/milk/wheat in that order.
Here is some info from their page.
z/d® ULTRA Allergen-Free Canine
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 usually a response to protein in the food. Prescription Diet® z/d® ULTRA Allergen-Free Canine dog food 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#%92s 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. z/d® ULTRA Allergen-Free Canine contains none of these allergens. This product is considered the "Gold Standard" by veterinarians at Hill#%92s 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.
Edit: Here is a study to give a little more info about the hydrolyzed diet and evidence that it works in known allergy dogs if anyone is unfamiliar with the concept or clinical trial
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=12895222&query_hl=1&itool=pubmed_docsum