You see your dog itching all over, suffering gastrointestinal problems, chronic diarrhoea or gas. He might be vomiting or even ear scratching or face rubbing.
The itching might lead you to suspect that your furry friend is the victim of fleas. The stomach problems might make you think that he ate spoiled food or is suffering from a more serious condition. A visit to your vet is in order and may lead to the conclusion that your dog has a food allergy.
Skin irritation in particular is a classic sign of adverse reaction to food. Food allergies are difficult to identify because their symptoms are so similar to other disorders. Feeding your dog an elimination food such as Hill’s Prescription Diet™ z/d™ ULTRA can help identify the source of the allergy so your vet can then recommend an allergen-free food for a prescribed period of time.
One of our staff authors prepared this article for you
Improves Everyday Ability to Get Up & Go
Hill's Science Diet Sensitive Stomach & Skin Grain Free dry dog food is gentle on stomachs. Nourishes skin & promotes a lustrous coat.
Supports energy level & beautiful coat. Helps keep immune system, heart & kidneys healthy
Hill's Science Diet Adult 7+ Variety Pack
Fewer calories for less active dogs, who prefer smaller kibble
A delicious complement to the nutrition of Science Diet dry dog food
Chicken & barley entree with great taste and precisely balanced nutrition to support 5 essential building blocks for lifelong health
Clinically proven kibble technology to reduce plaque & tartar build-up
Delicious braised beef paired with tender vegetables in a succulent stew
Science Diet's breakthrough nutrition supports ultimate digestive well-being & healthy microbiome
Science Diet's breakthrough nutrition supports ultimate digestive well-being & healthy microbiome
Supports digestive health, nourishes skin and promotes a lustrous coat
A delicious complement to the nutrition of Science Diet Small Paws 7+ dry dog food
Science Diet's breakthrough nutrition supports ultimate digestive well-being & healthy microbiome
A delicious complement to the nutrition of Science Diet Small & Mini dog food
Hill's Science Diet Sensitive Stomach & Skin dry dog food is gentle on stomachs while nourishing skin & promoting a lustrous coat.
Low calories & L-Carnitine help promote ideal body weight, support healthy mobility & maintain heart function
Chicken & Barley recipe with precisely balanced nutrition to support mobility and muscle mass for older dogs
Supports healthy joints, immune system, digestion, lean muscle & beautiful coat
Clinically proven kibble technology to reduce plaque & tartar build-up, specially designed for small & mini dogs
Use this dog washing supply checklist to help you get all the materials needed, making bathing your dog at home a fun and easy experience.
Your Dog Ate Deodorant! What You Need to Know
Understand the signs of aging in dogs, so you know what to look for, and learn how to keep him feeling youthful and vibrant in his golden years.
Learn how to make rainy day walks with your dog enjoyable for you both, including how to encourage him to get outside and wear rain gear.
Learn how to identify different types of worms in your dog's poop, how worms can affect their health & what vets may recommend for treatment & prevention.
Do you know where your dog food of choice comes from? Is it truly Made in the USA? Learn about, label products as Made in the USA.
It's a tasty treat, but is pineapple safe for dogs? Discover the pros and cons of feeding your dog pineapple and how to do it safely.
Obesity can cause serious canine health issues, but following these 4 steps to achieve and maintain a healthy weight for your adult dog can help.
Discover how common dental disease is in dogs and what you can do to help prevent it happening to your dog.
Learn the underlying reasons why your dog is vomiting, helping you understand when to be concerned that a larger health issue is at play.
Learn how to spot bullying behavior in dogs, including signs like being pushy, aggressive and stealing other dogs' food, and tips for putting a stop to it.
Learn why dogs bark at the sound of the doorbell ringing and how to train them not to.
Understand what causes ear infections in your dog and what you can do to help prevent and treat them in the future.
Understand what it means for your female dog to be in heat and what you can do to provide her with the best care.
Learn whether celery is bad for your dog, how much is a safe amount, and preparation tips if you think they'll enjoy it as a snack.
Learn how dogs can benefit from yoga's mindful breathing, physical touch and guided movements, and how to get your dog involved in your yoga routine.
Why do dogs like belly rubs? Learn what your dog is really telling you when he wants a belly rub (and why other dogs may not want one).
Find out why exercising is so important to your puppy's overall healthy by reading through these 4 helpful facts.
An enlarged spleen in dogs can be potentially life-threatening, but the condition is treatable. Learn about the causes, symptoms and treatment options.
Our low calorie formula helps you control your dog's weight. It's packed with high-quality protein for building lean muscles, and made with purposeful ingredients for a flavorful, nutritious meal. Clinically proven antioxidants, Vitamin C+E, help promote a healthy immune system.
Our low calorie formula helps you control your dog's weight. It's packed with high-quality protein for building lean muscles, and made with purposeful ingredients for a flavorful, nutritious meal. Clinically proven antioxidants, Vitamin C+E, help promote a healthy immune system.
©2025 Hill's Pet Nutrition, Inc. As used herein, denotes registered trademark status in the U.S. only; registration status in other geographies may be different. Your use of this site is subject to the terms of our Legal Statement. About our Ads. Cookie Consent Tool