If your dog won’t stop scratching or your cat keeps having digestive upsets, allergies might be to blame. Pet allergies are one of the most common reasons dogs and cats visit the veterinarian — and one of the most frequently misunderstood. The challenge is that seasonal allergies and food allergies can look remarkably similar on the surface, yet they require very different approaches to diagnose and manage. At 30th Street Animal Hospital, we help pet owners in Indianapolis get to the root of their pet’s discomfort so they can find lasting relief — not just temporary fixes.
What Are Pet Allergies?
Just like people, dogs and cats can develop immune system responses to substances that are otherwise harmless. When a pet’s immune system overreacts to a particular trigger — whether it’s a pollen in the air or a protein in their food — the result is an allergic reaction that can affect the skin, digestive system, respiratory tract, and more.
Pet allergies fall into several broad categories: environmental allergies (which include seasonal allergens like pollen, mold, and dust mites), food allergies, and contact allergies caused by direct exposure to irritants like certain cleaning products or fabrics. Of these, seasonal and food allergies are by far the most common — and the most commonly confused with each other.
Understanding which type of allergy your pet is dealing with is the essential first step toward effective treatment. Treating a food allergy as though it were seasonal, or vice versa, rarely produces lasting improvement and can leave your pet suffering unnecessarily.
Seasonal Allergies in Pets: What to Look For
Seasonal allergies — also called atopic dermatitis or environmental allergies — occur when a pet’s immune system reacts to airborne allergens such as tree pollen, grass pollen, mold spores, or dust mites. In Indianapolis, where seasonal changes are pronounced, pets can be particularly vulnerable during spring and fall when pollen counts are at their highest.
The hallmark sign of seasonal allergies in pets is itching — often intense and focused on specific areas of the body. Dogs with seasonal allergies frequently scratch and lick their paws, rub their faces, and develop redness or inflammation in the groin, armpits, and skin folds. Ear infections that recur seasonally are another common indicator, as the same inflammatory response that affects the skin can affect the ear canal lining.
Cats with seasonal allergies may show similar signs — excessive grooming, hair loss from over-licking, facial rubbing, and miliary dermatitis, a pattern of small crusty bumps along the back and neck. Some cats also develop recurrent skin lesions known as eosinophilic plaques.
A key characteristic of seasonal allergies is their timing. If your pet’s symptoms appear or worsen at particular times of year and improve during others, environmental allergens are likely involved. However, pets with year-round exposure to indoor allergens like dust mites may show persistent rather than seasonal symptoms, which can complicate the picture.
Food Allergies in Pets: What to Look For
Food allergies develop when a pet’s immune system mounts a response to a specific ingredient in their diet — most commonly a protein source such as chicken, beef, dairy, or eggs. Contrary to popular belief, food allergies are not caused by a pet eating the same food repeatedly — they develop after a period of exposure, meaning a pet can develop an allergy to a food they have eaten without problems for months or even years.
The signs of food allergies in pets overlap significantly with those of seasonal allergies — itching, skin inflammation, ear infections, and hair loss are all common. However, food allergies have several distinguishing features that can help differentiate them.
Food allergies tend to be non-seasonal — they persist year-round regardless of the time of year or pollen count. Gastrointestinal symptoms such as vomiting, diarrhea, loose stools, and excessive gas are more commonly associated with food allergies than with environmental triggers. Food-allergic pets may also show itching that is concentrated around the face, ears, paws, and rear end — a distribution that can offer a useful diagnostic clue.
Importantly, food allergies do not respond to antihistamines or steroids the way environmental allergies often do. If your pet’s symptoms persist despite these treatments, food allergy deserves strong consideration.
Why Accurate Diagnosis Matters
Distinguishing between seasonal allergies and food allergies requires more than observation — it requires a systematic diagnostic approach guided by your veterinarian. Self-diagnosing and switching foods randomly, for example, is one of the most common mistakes pet owners make. Without a structured elimination diet trial using a truly novel or hydrolyzed protein source, dietary changes rarely produce reliable results and can actually make diagnosis more difficult.
Your veterinarian may recommend allergy testing — either intradermal skin testing or serum testing — to identify specific environmental triggers. For food allergies, the gold standard diagnostic tool remains a strict dietary elimination trial lasting eight to twelve weeks, during which your pet eats only a carefully selected novel or hydrolyzed diet with no treats, flavored medications, or supplements that could interfere with results.
At 30th Street Animal Hospital, our approach to diagnosing pet allergies is thorough and methodical. We take a detailed history, perform a comprehensive physical exam, and work with you to develop a diagnostic plan that gets to the real answer — because treating the wrong allergy type wastes time and leaves your pet uncomfortable.
Treatment Options for Seasonal and Food Allergies
Once the type of allergy has been accurately identified, effective management becomes much more achievable.
For seasonal allergies, treatment options have expanded significantly in recent years. Depending on the severity of your pet’s symptoms, your veterinarian may recommend antihistamines, fatty acid supplements to support skin barrier function, medicated shampoos, topical treatments, or prescription medications such as Apoquel or Cytopoint — both of which have been highly effective for dogs with environmental allergies. For pets with severe or persistent atopy, allergen-specific immunotherapy — allergy shots or sublingual drops — can help desensitize the immune system over time and produce long-term improvement.
For food allergies, the primary treatment is strict dietary management. Once the offending ingredient has been identified through an elimination trial, keeping it out of your pet’s diet permanently is the most effective strategy. Your veterinarian can help you identify a nutritionally complete diet that avoids your pet’s triggers without sacrificing quality or palatability.
In many pets, both types of allergies coexist — a phenomenon known as threshold effect, where the combined burden of multiple allergens tips the immune system into an active reaction. Managing both simultaneously is often necessary for the most meaningful improvement.
Conclusion: Your Pet Doesn’t Have to Live with Allergy Discomfort
Persistent itching, recurring ear infections, and gastrointestinal upset are not simply facts of life for an allergic pet. With an accurate diagnosis and the right management plan, most pets with seasonal or food allergies experience meaningful — often dramatic — improvement in their comfort and quality of life.
At 30th Street Animal Hospital in Indianapolis, we are committed to getting to the bottom of your pet’s allergy symptoms and building a treatment plan that actually works. If your dog or cat has been struggling with signs of allergies, don’t wait for things to worsen. Book your pet’s appointment today for trusted, compassionate veterinary care.
Frequently Asked Questions
Q1. How do I know if my pet has seasonal allergies or food allergies?
The timing and nature of your pet’s symptoms are important clues. Seasonal allergies tend to worsen at specific times of year and often respond to antihistamines or steroids. Food allergies are typically year-round, may include gastrointestinal symptoms, and do not respond well to those same medications. A veterinary evaluation and proper diagnostic testing are the most reliable way to distinguish between the two.
Q2. What is an elimination diet trial and how does it work?
An elimination diet trial involves feeding your pet a single novel protein and carbohydrate source — one they have never eaten before — or a hydrolyzed protein diet for eight to twelve weeks. During this period, no other foods, treats, or flavored supplements are given. If symptoms improve significantly, food allergy is confirmed. Ingredients are then reintroduced one at a time to identify the specific trigger.
Q3. Can pets have both seasonal and food allergies at the same time?
Yes — and it is more common than many people realize. When a pet has multiple allergy triggers, the combined effect can make symptoms more severe and harder to control. Managing both types simultaneously is often necessary to achieve meaningful relief.
Q4. Are certain breeds more prone to pet allergies?
Yes. Dogs such as Labrador Retrievers, Golden Retrievers, Bulldogs, West Highland White Terriers, and German Shepherds are among the breeds with a higher predisposition to allergic skin disease. Certain cat breeds including Siamese and Abyssinians may also be more susceptible. However, any pet can develop allergies regardless of breed.
Q5. Are over-the-counter allergy medications safe for pets?
Some human antihistamines — such as diphenhydramine — can be used in pets under veterinary guidance, but many OTC products contain ingredients that are harmful to animals. Never administer any medication to your pet without first consulting your veterinarian. Prescription options designed specifically for pets are often significantly more effective and better tolerated.
