Food Allergies vs. Environmental Allergies in Pets: How Can You Tell the Difference?

Is your pet constantly scratching, licking their paws, or experiencing recurring skin irritation? Allergies are a common cause of discomfort in dogs and cats, but identifying the trigger isn't always easy. At Pasternak Veterinary Center in West Los Angeles, we help pet owners understand the differences between food allergies and environmental allergies so their companions can receive appropriate care.

What Are Food Allergies in Pets?

Food allergies occur when a pet's immune system reacts to specific ingredients in their diet, often proteins such as chicken, beef, or dairy. Unlike environmental allergies, food allergies typically cause symptoms throughout the year rather than during specific seasons.

Common symptoms include persistent itching, skin inflammation, recurring ear infections, and occasionally digestive problems such as vomiting or diarrhea. Food allergies can develop even when a pet has eaten the same food for years.

What Causes Environmental Allergies in Dogs and Cats?

Environmental allergies develop when pets react to substances in their surroundings, including pollen, grass, mold, and dust mites. Pets may encounter outdoor allergens throughout much of the year. Some experience seasonal flare-ups, while others develop year-round symptoms from indoor allergens.

Environmental allergies commonly affect the skin, paws, ears, and face. Dogs may frequently lick their feet, while cats may excessively groom or develop irritated skin.

Key Signs That May Help Identify Your Pet's Allergies

Although food and environmental allergies share many symptoms, certain patterns can offer useful clues:

•          Seasonal itching: Symptoms that worsen during particular seasons may suggest environmental allergies.

•          Year-round symptoms: Persistent itching can occur with food allergies or indoor environmental allergens.

•          Digestive problems: Vomiting or diarrhea alongside skin irritation may raise suspicion of a food allergy.

•          Recurring ear infections: Both allergy types can contribute to repeated ear inflammation and infections.

•          Paw licking and scratching: These behaviors are common with both types and require further evaluation.

Because symptoms overlap, a veterinary examination is essential to determine the underlying cause.

How Do We Diagnose Food and Environmental Allergies?

At Pasternak Veterinary Center, we review your pet’s medical history, diet, environment, and symptoms and evaluate other causes of itching, including fleas, mites, and skin infections. If we suspect a food allergy, we may recommend a carefully monitored elimination diet using a nutritionally balanced food with a protein source your pet has not eaten before. We tailor the plan to your pet’s needs, food preferences, and your budget. The selected diet is typically fed exclusively for about eight weeks, with specific guidance on treats, supplements, and flavored medications. If symptoms improve, a supervised reintroduction of the previous food helps confirm whether food is responsible. Environmental allergies are assessed through your pet’s history, symptom patterns, and evaluation of other possible causes.

Managing Your Pet's Allergies

Treatment depends on the underlying trigger. Food allergies are generally managed by avoiding the ingredients responsible for the reaction. Environmental allergies may require allergen management, medications, or other individualized therapies to reduce inflammation and itching. Our goal is to identify contributing factors, relieve discomfort, and develop a practical long-term management plan.

If your dog or cat is experiencing persistent itching or skin irritation, visit Pasternak Veterinary Center in Los Angeles, CA. We welcome walk-ins during regular business hours. Call (310) 268-2275 to learn more about our veterinary allergy care.