Z/D Small Bites Hydrolyzed Chicken Flavor Dry Dog Food
Verified Jun 10, 2026
This is a veterinary therapeutic dry food formulated for adult dogs with suspected or confirmed adverse food reactions that show up as skin or digestive problems. It uses hydrolyzed chicken proteins, which are broken down into very small fragments to help reduce the chance of triggering the immune system, and corn starch as the main carbohydrate source. Added fibers, omega-3 and omega-6 fatty acids, and a balanced vitamin and mineral mix support digestive function and skin health while providing complete maintenance nutrition.
From a nutritional and clinical perspective, this is a high-quality therapeutic diet specifically designed for adult dogs with food allergies or sensitivities. The use of hydrolyzed chicken as the sole animal protein source, combined with feeding-trial validation and carefully balanced nutrients, makes it very suitable as an elimination or long-term maintenance diet for dogs with chronic skin or GI signs related to food. It’s best used under veterinary guidance, especially for pets with complex medical histories.
The KibbleLab Score (1–10) is assessed from publicly available product data. Our evaluation is science-based, not marketing-based.
KibbleLab may earn an affiliate commission when you buy through a link. No one can pay for a higher score, or to change what we recommend for your pet.
At a Glance
KibbleLab Review
Strengths
- Hydrolyzed chicken and chicken liver as the protein sources, which are designed to reduce the risk of triggering food-allergic reactions.
- Formulated and validated through AAFCO feeding trials for complete and balanced adult maintenance nutrition, which gives good evidence for digestibility and overall adequacy.
- Moderate protein and fat levels with controlled minerals and added omega-3 and omega-6 fatty acids, supporting skin, coat, and overall health in dogs with sensitivities.
- Inclusion of multiple fiber sources (ground pecan shells, cellulose, beet pulp, citrus pulp, flaxseed) to help support gastrointestinal health and stool quality.
Considerations
- Contains chicken and soy (in hydrolyzed and oil forms), so it is not appropriate if your veterinarian has specifically advised a non-chicken or non-soy diet rather than a hydrolyzed-protein approach.
- Designed for adult maintenance only, so it is not intended for growing puppies, pregnant, or nursing dogs unless your veterinarian provides specific guidance.
- Calorie density is relatively high at 397 kcal per cup, so portion control is important to prevent weight gain, especially in less active dogs.
Full Ingredient List
Ingredients and analysis reflect manufacturer data at the time of our last update and can change without notice. Always check the actual product packaging before feeding.
Ingredient filtering helps identify compatible options but is not a substitute for a veterinary elimination diet.
Top 5 Ingredients Explained
01
Corn Starch
Corn starch is a concentrated carbohydrate used in pet foods primarily as a thickener, binder and texture enhancer for kibbles, treats and canned gravies. It supplies digestible calories with minimal protein or micronutrients, so while generally safe for most dogs and cats it can contribute to excess calories and blood‑sugar increases in overweight or diabetic pets and may be a concern for animals with grain sensitivities.
02
Hydrolyzed Chicken Liver
Hydrolyzed chicken liver is enzymatically broken-down chicken liver used in pet foods as a highly palatable, easily digested source of protein, amino acids and liver-derived nutrients (notably vitamin A and B vitamins), and it’s commonly included in hypoallergenic or limited-ingredient diets because hydrolysis reduces the likelihood of an allergic reaction. While it can improve digestibility and flavor and add nutrient density, very sensitive animals may still react to hydrolyzed proteins, and concentrated liver ingredients can contribute excess vitamin A or purines if overused, so follow feeding guidelines and consult your veterinarian for pets with known sensitivities or metabolic concerns.
03
Hydrolyzed Chicken
Hydrolyzed chicken is chicken protein that has been enzymatically broken down into small peptides and amino acids and is used in pet foods as a highly digestible protein source, commonly formulated into hypoallergenic or elimination diets for dogs and cats. Because the proteins are reduced in molecular size they are less likely to trigger food‑allergy reactions and still supply essential amino acids, but some animals can remain reactive and these diets should be used under veterinary guidance; palatability may also differ from intact protein formulas.
04
Pecan Shell
Pecan shell is an insoluble, high‑lignin plant material sometimes used as a low‑cost fiber or bulking agent in pet products, but it provides negligible protein, fat, vitamins or minerals for dogs and cats. Because shells are hard, largely indigestible and potentially abrasive or sharp, they can cause dental wear, oral or gastrointestinal irritation or obstruction and may carry contaminants, so they should not be fed in whole form and only used when finely milled and validated as food‑grade and safe by the manufacturer.
05
Cellulose
Cellulose is a purified, plant-derived insoluble fiber commonly used in pet foods as a bulking agent, binder and to adjust kibble texture or calorie density. It is not digestible for dogs or cats but can help increase stool bulk, support satiety and assist hairball control in some formulations; however, it provides no usable nutrients and excessive inclusion may dilute dietary nutrients or cause gastrointestinal upset, particularly in obligate carnivores like cats.
Nutritional Breakdown
How to read As Fed versus Dry Matter
As fed shows the numbers straight off the label, water included. Dry matter removes the water so you can compare a wet food and a dry food fairly.What is calorie density
How many calories the food packs per unit. Denser foods mean smaller portions for the same calories.Product Details & Brand
Product Specs
AAFCO Nutritional Adequacy
What is AAFCO
Association of American Feed Control Officials. It sets the nutritional
adequacy standards US pet foods are measured against.
What is AAFCO
Association of American Feed Control Officials. It sets the nutritional adequacy standards US pet foods are measured against.Brand
Hill's Prescription Diet offers clinically formulated therapeutic nutrition designed to help manage specific health conditions in pets such as kidney disease, urinary issues, skin sensitivities, digestive problems, and weight management. Sold primarily through veterinarians, it's backed by research from Hill's Pet Nutrition Center and veterinary nutritionists.
Visit Hill's Prescription DietWSAVA publishes criteria for evaluating a manufacturer (qualified nutritionists, feeding trials, published research); it does not certify or endorse brands.
Manufacturer
Hill's Pet Nutrition maintains strict quality and safety standards in all of its manufacturing sites, with adherence to rigorous ingredient testing and safety validation procedures. Facilities follow current Good Manufacturing Practices (cGMPs) and are regularly audited for quality, safety, and consistency. All products meet or exceed AAFCO and FDA regulatory standards for pet food.
Manufacturing details are compiled from public sources and not independently verified; they may not reflect contract manufacturing or co-packing.
Recall History
Hill's Prescription Diet Z/D Small Bites Hydrolyzed Chicken Flavor Dry Dog Food has no recalls since 2014.
Source: FDA Pet Food Recall Database · Monitored daily
Sign up for the full picture
Feeding Calculator
Personalized portion sizes based on your pet's weight, age, and activity level.
Get startedSimilar Foods
Post your dog's report card and challenge friends to check their food.
Frequently Asked Questions
Has Hill's Prescription Diet ever been recalled?
We have no recalls on record for Hill's Prescription Diet. We monitor the FDA Pet Food Recall Database daily.
How does KibbleLab rate foods?
Our scores are based on ingredient composition, nutritional profile, AAFCO compliance, and health considerations. We don't penalize by-products, grains, or synthetic preservatives. Brands cannot pay for higher scores.
Is KibbleLab a substitute for veterinary advice?
No. KibbleLab provides data-driven food analysis, not medical advice. Always consult your veterinarian before making dietary changes, especially for pets with health conditions.
KibbleLab provides informational content only. This is not veterinary advice. Always consult a qualified veterinarian before changing your pet's diet.
KibbleLab may earn affiliate commissions through product links. No one can pay for a higher score, or to change what we recommend for your pet.
Product data sourced from manufacturer websites, AAFCO statements, and FDA recall database. Last verified dates reflect our most recent data check.
Continue with Google
Continue with Facebook