Dog Allergies in Spring in Minnesota: Symptoms, Causes, and How to Help Your Dog

Spring arrives late in Minnesota, but when it does, it brings more than warmer temperatures and longer days. For many dogs across the state, the season also marks the start of months of itching, paw licking, and skin irritation driven by environmental allergens.

If your dog seems uncomfortable every year once the snow melts, seasonal allergies may be the cause. Understanding what triggers these reactions in Minnesota, what to watch for, and how to respond can make a real difference in your dog’s quality of life from April through the warmer months ahead.

Key Insight: According to the Minnesota Veterinary Medical Association, many pet owners mistake allergy-driven itching and chewing for normal dog behavior — when effective treatments are often readily available.

When Does Spring Allergy Season Start for Dogs in Minnesota

Minnesota’s cold winters delay the start of allergy season until late March or early April — a later start compared to many other states, which actually makes Minnesota one of the better states for allergy sufferers overall. That said, once the season begins, it can be persistent and uncomfortable for sensitive dogs.

Spring is when tree allergy season begins in Minnesota. The main tree allergies are caused by ash, oak, maple, hickory, cedar, willow, and mulberry trees. Tree allergy season usually starts around late March or early April and tapers off in May.

Minnesota’s allergy season usually begins in April and ends around late October, with the worst months being May, June, and September. For dogs, this means the spring window — roughly April through early June — is when tree pollen exposure peaks and allergy symptoms are most likely to flare up.

Seasonal allergies tend to peak when plants are in bloom, but allergic reactions may persist even after blooming is over because allergens remain on the surfaces of grass and in the home environment. Allergy season can also be extended because of how far allergens are able to travel with the wind.

Pro Tip: If your dog has shown allergy symptoms in previous springs, talk to your vet before April arrives. Starting treatment proactively — before pollen counts climb — can reduce the severity of your dog’s symptoms.

You can also check with other Minnesota dog owners about their experiences with spring allergies in different parts of the state. For example, dogs in colder northern climates like Alaska may see an even later season start, while states farther south experience earlier and longer allergy windows.

What Causes Dog Allergies in Spring in Minnesota

In Minnesota, most spring allergies are the result of tree pollen. As temperatures rise and trees begin to pollinate, airborne pollen levels increase rapidly — and dogs encounter these particles every time they step outside.

The most common environmental factors that trigger seasonal allergies include tree pollen in spring, grass pollen in summer, and weed pollen in fall — causing a reaction when pets encounter pollen that gets trapped in their fur and on their paws.

The Detroit Lakes, Fergus Falls, Thief River Falls, Bemidji, and Voyageurs National Park areas have spring allergies tied to ash, oak, willow, and maple pollen. Dogs living in or visiting these regions may experience more intense exposure during peak pollination weeks.

Beyond pollen, other triggers also play a role in spring allergy flares:

• Mold spores: Indoor and outdoor mold spores can cause problems year-round, but they are typically most troublesome in the spring and fall when there is extra moisture in the air.
• Dust mites: Dust mites are a year-long problem, but spring cleaning can cause the microscopic dust mites’ feces to be disturbed, therefore triggering allergies.
• Other environmental factors: Environmental factors such as mold, dust mites, and even the dander of people or other animals can exacerbate a dog’s allergic reactions.

Seasonal allergies happen when a pet’s immune system overreacts to things like pollen from trees, grass, and weeds, as well as mold and fungi. When pets encounter these allergens — either by breathing them, touching them, or even licking them off their fur — their bodies react, leading to allergy symptoms.

It’s also worth knowing that 85% of dogs with allergies have environmental allergies, caused by dust, dust mites, grasses, molds, weeds, and/or trees. In Minnesota, spring sets the stage for several of these triggers to peak simultaneously, which is why some dogs seem to struggle more during this season than any other.

Minnesota’s diverse spring environment also brings increased insect activity. If you’re curious about what other creatures emerge in the state during spring, our guides on types of ants in Minnesota and types of wasps in Minnesota cover species your dog may encounter outdoors.

Signs Your Dog Has Spring Allergies in Minnesota

While people tend to have allergic signs mostly related to the respiratory system, dog allergies are seen primarily as chronic problems associated with the skin and related structures. This means that if your dog is sneezing a little but scratching a lot, allergies are a more likely explanation than a cold.

Common signs to watch for include:

• Excessive scratching, licking, or chewing of the paws, belly, or ears
• Red, inflamed, or irritated skin
• Recurring ear infections or head shaking
• Watery eyes or clear nasal discharge
• Hair loss or thinning coat in affected areas
• Scooting or licking around the rear end
• Sneezing or mild respiratory symptoms

Signs of allergies often start as itching followed by chewing, biting, scratching, or licking. Red skin and hair loss are also common. Blackened and thickened skin that looks like elephant skin can be a symptom of a long duration of uncontrolled disease.

Dogs with allergies might compulsively chew on their skin, which can lead to raw, exposed areas known as hot spots. These areas can quickly become infected if left untreated.

Dogs with allergies frequently develop ear infections, and many pets with allergies also have infections from bacteria and yeast. These infections are common because the immune system is not responding properly to fight the organisms normally found on the skin.

Important Note: Owners should contact their veterinarian if there are any clinical signs associated with allergy, but especially if there is hair loss, odor, or redness to the skin, as this may indicate a skin infection secondary to allergic skin inflammation.

You might wonder whether your dog’s symptoms are allergies or something else entirely. Spring allergies in pets can be mistaken for food allergies, mites, and respiratory conditions, which is why a proper veterinary diagnosis is always the right first step.

Which Dog Breeds Are Most Prone to Spring Allergies

There isn’t a single breed that is most prone to allergies, but research shows that certain breeds are diagnosed with allergic skin disease (canine atopic dermatitis) more often than others. These breeds include Labrador Retrievers, Golden Retrievers, West Highland White Terriers, French Bulldogs, Boxers, Chinese Shar-Peis, and others. This increased risk is thought to be partly due to inherited genetic factors that affect the immune system, though environmental influences also play a role.

Here’s a closer look at some of the breeds most commonly affected by seasonal allergies:

Atopy symptoms in Golden Retrievers can start in adolescence — between 1 and 3 years of age — and usually intensify with age. Allergies tend to develop between the ages of 6 months and 3 years, but it can happen later in life, depending on various factors.

Any dog, purebred or mixed, can develop allergies. If your dog is showing signs of seasonal discomfort and you live in Minnesota, it’s worth discussing their breed history and risk factors with your vet — especially as spring pollen season approaches.

If you’re curious about other wildlife your dog might encounter on spring walks in Minnesota, our guide on types of spiders in Minnesota and types of moths in Minnesota may be useful reading.

How Vets Diagnose Seasonal Allergies in Dogs in Minnesota

Getting an accurate diagnosis is one of the most important steps you can take for an allergic dog. Accurately diagnosing spring allergies in dogs is an essential step toward helping your pet find relief. The process typically starts with a thorough examination and a detailed discussion about the symptoms you’ve noticed.

Because diagnosing allergies in companion animals can be quite difficult, veterinarians will often start by ruling out all other possible causes of an itch, such as parasites or food allergies.

The diagnostic process typically involves several steps:

1. Medical history review: You may be asked about changes in your dog’s behavior, grooming habits, or whether symptoms worsen after spending time outside.
2. Physical examination: Your vet will assess skin condition, ear health, coat quality, and other physical indicators of allergic disease.
3. Ruling out other conditions: Your vet will begin by ruling out other common causes of itching and skin irritation — including fleas, food allergies, mange, and bacterial or yeast infections — before confirming an environmental allergy diagnosis.
4. Blood testing: A blood test, such as Heska’s Allercept or Nextmune’s Pet Allergy Xplorer, can be performed by your vet to determine what environmental allergens your dog is most allergic to based on where they live.
5. Intradermal skin testing: Intradermal skin testing performed by a veterinary dermatologist involves injecting small amounts of allergens into the skin and monitoring for reactions, which help identify the specific triggers to include in an immunotherapy formulation.

Minnesota has veterinary dermatology specialists available for more complex cases. Board-certified veterinary dermatologists, such as those at the Animal Emergency and Referral Center of Minnesota (AERC) in Oakdale and St. Paul, can provide advanced allergy diagnostics when a general vet referral is warranted.

Pro Tip: Keep a symptom diary for your dog before your vet visit. Note when symptoms started, whether they worsen after outdoor time, and which body areas are most affected. This information helps your vet narrow down the diagnosis more efficiently.

For dog owners in other states dealing with similar questions, our guides on dog allergies in spring in Colorado and dog allergies in spring in Connecticut cover state-specific allergy seasons and vet guidance.

How to Treat Spring Allergies in Dogs in Minnesota

Though seasonal allergies in dogs cannot be cured, they can be managed to help make your dog more comfortable. A multimodal approach — meaning a combination of different therapies — is usually the best way to help a dog with skin allergies. Goals of treatment include strengthening the skin barrier, managing itch, and preventing secondary skin infections.

Your vet may recommend one or more of the following treatment options:

Prescription Anti-Itch Medications

• Oclacitinib (Apoquel®) is an oral medication that’s among a new generation of highly effective anti-itch medications for dogs, blocking the itch right at its source, quickly and safely.
• Cytopoint, which contains a caninized monoclonal anti-IL-31 antibody, is an effective treatment against allergic dermatitis triggered by environmental allergens like pollen, mold, and dust. One of the unique advantages of Cytopoint is that it can be given to a dog of any age and it is a long-lasting seasonal allergy treatment, administered every 4–8 weeks via injection.
• Atopica™ is an oral medication that can take around a month for effects to be seen and is intended for long-term allergy control.

Steroids

Steroids like prednisone or prednisolone might be prescribed short-term for severe allergy cases. Steroid use increases hunger, thirst, and urination. Long-term steroid use may weaken the immune system, cause Cushing’s disease, and contribute to diabetes. Because of the dangerous long-term effects of steroids, systemic steroids should only be used for short-term control of symptoms.

Antihistamines

Antihistamines are often used, but they’re not as effective for dog and cat seasonal allergies compared to other treatments. They may still provide mild relief for some dogs, particularly as a supplementary option. Always consult your vet before giving your dog any antihistamine, and never use antihistamines that are combined with pseudoephedrine, a decongestant, as decongestants are toxic to pets.

Allergy Immunotherapy

If your dog’s allergies are persistent, allergy shots might be the answer. This treatment helps desensitize your dog to specific allergens over time, providing lasting relief and helping them build a tolerance for seasonal triggers. Allergy testing followed by hypo-sensitization injections is a very good option in many dogs with environmental-related allergies. An allergy test performed by a veterinary dermatologist determines the specific allergens affecting your pet, and based on this, a series of injections designed for the dog’s allergies are formulated. In many allergy dogs, this is extremely effective, leading to partial to complete resolution of allergic signs.

Topical and Supportive Treatments

• Frequent bathing with a hypoallergenic shampoo can be soothing to itchy, inflamed skin. Some shampoos are available over the counter, while others may require a prescription. Bathing also removes allergens from the skin and coat.
• Omega-3 fatty acids are often used in combination with other treatments for dogs and cats with itchy skin due to seasonal allergies. These fatty acids are important components of cells and are thought to improve the skin barrier.

Common Mistake: Do not give your dog human medications without veterinary guidance. Some are unsafe or ineffective in dogs. This applies to topical creams and sprays as well — products formulated for humans can be toxic to dogs.

Once the allergy seasons are determined for a dog based on prior history, the anti-itch medication typically is started prior to the start of the allergy season and continued one month past when the allergy season ends. In Minnesota, that means starting treatment in late March or early April.

To see how treatment approaches compare across different states, you can also read about dog allergies in spring in Georgia or dog allergies in spring in California.

How to Reduce Your Dog’s Exposure to Spring Allergens in Minnesota

While you can’t eliminate Minnesota’s spring pollen entirely, you can take meaningful steps to limit how much your dog is exposed to it. Managing spring allergies in dogs often requires a combination of approaches to help minimize exposure to allergens and relieve their symptoms.

After-Walk Routines

Since pollen and dust cling to your dog’s fur and paws, wiping them down with a damp cloth or pet wipes after walks can help reduce allergy flare-ups. Pay particular attention to the paws, underbelly, face, and ears — areas where allergens tend to accumulate and where allergy symptoms most often appear.

Bathing Schedule

Bathing affected pets one to two times per week with a shampoo specified by the pet’s veterinarian can decrease allergen accumulation on the coat. Regular baths are one of the simplest and most effective home strategies during peak pollen season in Minnesota.

Managing Outdoor Time

• Check local pollen counts before heading outdoors. On high-count days, keep walks shorter and avoid open fields or areas with heavy tree cover.
• Pollen counts are typically highest in the morning. Scheduling outdoor activity for late afternoon or after rainfall can reduce your dog’s exposure.
• Avoid letting your dog roll in grass or leaf litter during spring, as these surfaces collect and hold pollen.

Indoor Environment

Vacuum frequently, wash your dog’s bedding weekly, and use air purifiers to reduce allergens in your home. This is especially important during Minnesota’s spring months when open windows may allow pollen to enter the house.

While many people associate environmental allergens with the outdoors, they can also exist within your home, in the form of house dust mites and storage mites, which are prevalent year-round. The effect of multiple allergen sources can sometimes make seasonal allergies even more extreme for pets.

Flea Prevention

Make sure that your dog is on regular parasite prevention that controls fleas and ticks to ensure these parasites don’t contribute to itching and skin irritation. In Minnesota, flea activity picks up alongside warmer spring temperatures, and flea allergy dermatitis can layer on top of existing seasonal allergies.

Pro Tip: Consider keeping a log of your dog’s symptoms alongside local pollen count data. Over one or two seasons, patterns will emerge that help you and your vet anticipate and prepare for your dog’s worst allergy days in Minnesota.

Spring in Minnesota also brings increased activity from insects like beetles and caterpillars that your dog may encounter on walks. While most are harmless, some can cause localized skin reactions in sensitive dogs — another reason to rinse your dog off after time outdoors.

When to See a Vet About Your Dog’s Spring Allergies in Minnesota

Some allergy symptoms can be managed at home with guidance from a previous vet visit, but others require prompt professional attention. Knowing the difference helps you act quickly when it matters most.

Schedule a vet appointment if your dog:

• Is scratching, licking, or chewing to the point of creating raw or broken skin
• Has recurring ear infections each spring
• Shows signs of a skin infection, including odor, oozing, crusting, or significant hair loss
• Is not responding to over-the-counter antihistamines or previous treatments
• Is experiencing spring allergy symptoms for the first time
• Has symptoms that are worsening season over season

In-person veterinary care is required not only for diagnosing and treating allergies but also for preventing secondary infections that can arise from constant scratching and skin breakdown. Your vet can also help you develop an allergy management plan tailored to your dog’s specific needs.

Seek emergency care if your dog shows:

• Difficulty breathing, facial swelling, or hives, which are considered serious or emergency-level reactions requiring immediate veterinary care.
• Extreme lethargy or collapse following allergen exposure

Self-diagnosing your dog’s allergies and relying solely on home remedies can delay effective treatment and relief. Your veterinarian can perform allergy testing, prescribe medications that offer more targeted relief than OTC options, and recommend dietary changes or supplements that support skin health. In some cases, immunotherapy or “allergy shots” may be recommended for long-term management.

If your dog’s allergies are severe, recurring, or not well-controlled with standard medications, ask your vet for a referral to a veterinary dermatologist. These specialists can perform intradermal skin testing and formulate a customized immunotherapy protocol that targets your dog’s specific allergens — the closest thing to a long-term solution that currently exists for canine atopy.

Early intervention is key to preventing complications and keeping your dog healthy and happy during allergy season. The sooner you work with your vet to identify triggers and establish a management plan, the more comfortable your dog’s Minnesota springs will be.

If you’re interested in how spring allergy seasons compare in neighboring and other states, explore our guides on dog allergies in spring in Alabama, dog allergies in spring in Arkansas, and dog allergies in spring in Delaware for regional comparisons.