Dog Allergies in Spring in Michigan: Timing, Triggers, Breeds, and Treatment

Michigan winters are long and cold — and for dogs prone to seasonal allergies, that cold weather actually offers a brief reprieve. But once temperatures start climbing in late March, the state’s trees, grasses, and molds shift into high gear, and your dog may start showing signs of real discomfort before you’ve even noticed the season change.

Dog allergies in spring in Michigan follow a predictable pattern tied to the state’s pollen calendar, and understanding that pattern puts you in a much stronger position to help your dog get through the season comfortably. This guide covers everything you need to know: when allergy season begins, what’s triggering your dog’s reaction, how to recognize the signs, which breeds are most vulnerable, and what vets recommend for diagnosis and treatment.

When Does Spring Allergy Season Start for Dogs in Michigan

The allergy season in Michigan starts in the spring. Because Michigan has a cold winter, seasonal allergies commonly begin in early March. For your dog, this timing matters — symptoms can appear gradually as pollen counts rise, so what looks like a mild itch in late March may escalate significantly by May.

In southern Michigan, tree pollen starts in late March or early April, peaking in April and May. Grass pollen follows from late May to mid-July, with its peak in June. In central Michigan, tree pollen starts slightly later, in early to mid-April, and peaks in May. Grass pollen activity occurs from late May to early July, peaking in mid to late June.

Michigan allergy season begins in early March and ends after winter’s first hard freeze. The worst months are May, June, and September. If your dog’s symptoms follow this arc — worsening in spring and easing by late fall — seasonal allergens are almost certainly involved.

Key Insight: Michigan’s spring allergy window for dogs typically runs from late March through June, with the most intense period falling in April and May when multiple tree species are pollinating simultaneously.

The timing also varies slightly by region. Dogs in Detroit, Grand Rapids, Ann Arbor, and Lansing tend to see earlier symptom onset than dogs in northern areas like Traverse City or the Upper Peninsula, where cooler temperatures delay the pollen season by a few weeks. Monitoring a local pollen forecast through a resource like Pollen.com’s Michigan map can help you anticipate your dog’s worst days and plan outdoor time accordingly.

What Causes Dog Allergies in Spring in Michigan

Seasonal allergies in dogs, also known as atopic dermatitis, occur when a dog’s immune system mistakes harmless substances in the environment for threats. Spring allergies in dogs are almost always environmental in origin, meaning your dog’s immune system is overreacting to substances in the surrounding environment rather than something they ate.

In Michigan, tree pollen is the main allergen in the spring. Grass pollen is mainly produced during the summer months. The fall is when weeds produce pollen, so these allergies will be worse in late summer and up until the end of allergy season.

The most significant spring allergen sources in Michigan include:

• Tree pollen — Spring tree allergies in Michigan typically come from hickory, ash, oak, walnut, cedar, willow, and mulberry trees. Spring tree allergies usually pick up in March and end by late May.
• Grass pollen — Ryegrass, Bermuda grass, and other grasses such as Timothy grass and Kentucky bluegrass contribute to the pollen load as the season progresses into late spring and early summer.
• Mold spores — Michigan’s wet spring thaws create ideal conditions for outdoor mold growth in soil, leaf litter, and mulch. Mold spores are small reproductive cells produced by mold. Similar to pollen, mold spores cling to animals and to people’s clothing.
• Dust mites — Dust mites are a year-long problem. However, spring cleaning can cause the microscopic dust mites’ feces to be disturbed, therefore triggering allergies.

Important Note: Dogs’ immune systems contact allergens mainly via a skin route, with the respiratory system playing a much smaller role. This is why skin and ear signs are seen in dogs with allergies much more commonly than respiratory signs.

The warmer temperatures of spring trigger the abundant release of pollen — with tree pollination happening earlier in the season and grass pollination occurring at the later part of spring or early summer. In Michigan, this means your dog’s exposure window can stretch across several months as one pollen type fades and another peaks. Dogs in the northeastern United States and Great Lakes region tend to experience a compressed but intense allergy season compared to warmer southern states.

Signs Your Dog Has Spring Allergies in Michigan

Seasonal allergies manifest themselves differently in dogs than they do in humans, which may make it more challenging to identify. There are a few common symptoms of spring allergies in dogs you can watch for.

The most common signs of spring allergies in Michigan dogs include:

• Excessive scratching — Particularly around the face, ears, armpits, groin, and paws. Seasonal allergies can cause a constant, intense itch. If your dog cannot seem to stop scratching, allergies may be the reason. Itching can occur around the eyes, mouth, feet, armpit, abdomen, thighs, and anus.
• Paw licking and chewing — One of the most reliable indicators of environmental allergies. Seasonal allergies may also present as itchy skin in many dogs. This skin will usually be on their feet and legs, since these areas are exposed to pollen more than the rest of your dog’s body. Watch for chewing and licking the legs frequently.
• Recurrent ear infections — Dogs with seasonal allergies can be itchy in specific areas, such as their paws, or be itchy all over. They can also have recurring ear infections and skin infections.
• Hot spots and skin inflammation — Dogs with allergies might compulsively chew on their skin. Obsessive licking can result in raw, exposed areas known as hot spots. These areas can quickly become infected if left untreated.
• Watery or red eyes — Allergens can irritate your dog’s eyes, leading to excessive tearing. You might notice your dog’s eyes are more watery than usual, which can be their body’s attempt to flush out irritants.
• Sneezing and nasal discharge — Dogs can have allergic reactions that affect their respiratory systems. Persistent sneezing, a runny nose, or even congestion can be a sign that your dog is reacting to airborne allergens.
• Anal gland issues — Scooting and licking around the rectum is a very common issue noted with allergic dogs. The anal glands are scent marking glands inside the rectum which can become inflamed due to allergies. Dogs may show signs of scooting, licking around their rectum, and the gland can even abscess out through the skin.

Pro Tip: Keep a simple symptom diary noting when symptoms start, how severe they are, and what the pollen count was that day. This information is extremely valuable when you visit your vet and can help distinguish seasonal allergies from food sensitivities or other skin conditions.

Diagnosing the condition of a pet based on symptoms alone can be misleading. Spring allergies in pets can be mistaken for food allergies, mites, and respiratory conditions. If your dog’s symptoms consistently appear in March through June and ease over the summer or fall, seasonal allergens are almost certainly involved. You can also read about how dogs in other states experience similar spring patterns for comparison.

Which Dog Breeds Are Most Prone to Spring Allergies

The exact reason why pollen allergies develop in some dogs and not in others is not fully understood, but there’s likely a genetic component that makes some dogs more vulnerable than others. In general, at least 10% of the canine population are known to suffer from allergy season.

Certain breeds carry a higher inherited risk for canine atopic dermatitis. If you own one of the following breeds in Michigan, it is worth being proactive about spring allergy management:

Atopic dermatitis in dogs typically first appears between 1 and 3 years of age. If your dog is in this age range and begins showing seasonal symptoms for the first time, it’s worth scheduling a veterinary evaluation rather than waiting to see if the symptoms resolve on their own.

Michigan’s wildlife-rich environment also means your dog may encounter additional spring triggers during outdoor time. Insects like bees, ants, and beetles become active alongside pollen season, and contact with certain insects can cause localized skin reactions in allergy-prone dogs that compound existing spring symptoms.

How Vets Diagnose Seasonal Allergies in Dogs in Michigan

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.

Your veterinarian will ask you a series of questions such as how long the itching has been going on, where the dog is chewing, licking, and/or scratching, and how itchy the dog is on a scale from 0 to 10. Your vet will look for signs of fleas, sarcoptic mange, rashes, and skin infections. If a flea preventive is not being used, one will probably be recommended.

There’s not a specific test to make a diagnosis of environmental allergies, so a presumptive diagnosis is typically made based on the history, symptoms, physical exam findings, and response to treatment.

If further testing is needed to identify specific allergens, your vet has two main options:

1. Blood (serology) testing — A blood test, such as Heska’s Allercept or Nextmune’s Pet Allergy Xplorer, is performed by your vet to determine what environmental allergens your dog is most allergic to based on where they live.
2. Intradermal skin testing — The most accurate test for environmental allergies in dogs is intradermal allergy testing, typically performed by a veterinary dermatologist. This involves shaving a patch of fur then exposing your dog to small amounts of allergens. The skin is assessed after 30 minutes to see if there has been any reaction.

Pro Tip: Understanding your dog’s daily routine and environment can provide important clues about potential allergens. You may be asked about changes in their behavior, grooming habits, or whether symptoms worsen after spending time outside.

Because spring allergies in dogs can often mimic other health conditions, additional diagnostic tests like skin or blood tests may be recommended to identify the specific allergens causing your dog discomfort. Your dog’s medical history, including any previous allergic reactions, also provides valuable insight into their condition.

There is no specific test to diagnose allergies. Rather, allergy testing identifies specific allergens that affect your dog but is only useful once you know your dog has allergies. The offending allergen does not necessarily need to be identified for successful treatment.

How to Treat Spring Allergies in Dogs in Michigan

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.

Though seasonal allergies in dogs cannot be cured, they can be managed to help make your dog more comfortable. Michigan’s concentrated spring pollen season means treatment often needs to begin in late March, before symptoms escalate. Here are the primary treatment options your vet may recommend:

Prescription Anti-Itch Medications

• Apoquel (Oclacitinib) — An immuno-modulatory drug that manages itching associated with allergic dermatitis triggered by environmental allergens. Apoquel is only used for dogs over one year of age and is administered orally twice a day or once a day, depending on veterinarian instructions.
• Cytopoint — Contains a caninized monoclonal anti-IL-31 antibody and is an effective treatment against allergic dermatitis triggered by environmental allergens like pollen, mold, and dust. One unique advantage is that it can be given to a dog of any age and is a long-lasting seasonal allergy treatment, administered every 4–8 weeks via injection.
• Steroids (short-term) — 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 these dangerous long-term effects, systemic steroids should only be used for short-term control of symptoms.

Topical and Supportive Treatments

• Medicated shampoos — 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 — Omega-3 fatty acids are often used in combination with other treatments for dogs with itchy skin due to seasonal allergies. These fatty acids are important components of cells and are thought to improve the skin barrier.
• Ear medications — Ear medications such as Easotic, Mometamax, Posatex, and Tresaderm are prescribed to treat bacterial and/or yeast infections in a dog’s ears. After treatment, make sure to schedule a follow-up appointment with your veterinarian to recheck that the infection has resolved.

Immunotherapy (Allergy Shots or Drops)

In some cases, it may be possible to desensitize your pet to the offending allergens through a series of “allergy shots” or allergen-specific immunotherapy (ASIT). To receive allergy shots, your pet would need to undergo testing with a dermatologist to determine what your pet is allergic to. Improvement can take six months to one year, so pets taking allergy shots often receive other treatments in the meantime.

Common Mistake: Do not give human medications without veterinary guidance. Some are unsafe or ineffective in dogs. Always consult your vet before starting any new treatment, even over-the-counter options.

Dogs with spring allergies in neighboring states like Ohio or Indiana face similar pollen-driven triggers, and the treatment approaches are largely consistent across the Great Lakes region. You can also compare notes with how dogs in Arkansas or Georgia are treated for more aggressive allergy seasons.

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

Managing your dog’s environment alongside medical treatment can significantly reduce symptom severity. Managing spring allergies in dogs often requires a combination of approaches to help minimize exposure to allergens and relieve symptoms. Every dog is different, and finding the right balance can make a world of difference in their comfort.

After Outdoor Time

• 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.
• There are dog-safe wipes available for purchase that make it easy to wipe your dog’s legs and feet down after they have been outside. This will reduce the amount of time they are exposed to pollen and can help them feel better while they are inside.
• Bathe your dog regularly during peak pollen months. Washing your dog at least once every week removes allergens that can get caught in hair and fur.

Managing Outdoor Time

• If you know the pollen count is high for your area on a given day, keep your dog inside unless it’s to relieve themselves. This will limit their exposure to the allergens in the air and can help reduce their symptoms.
• Bring your pet indoors before you mow. Whether your pet is allergic to grasses or pollen, keeping your dog indoors while you mow will help decrease exposure to allergens.
• On high pollen days, try to limit outdoor activities, especially during peak pollen hours (early morning and evening).

Inside the Home

• Vacuum frequently, wash your dog’s bedding weekly, and use air purifiers to reduce allergens in your home.
• Humidifiers and air purifiers can also help dogs with seasonal allergies. Run the device close to where your dog sleeps so they can have the greatest benefits from it.
• Use the air conditioner. Pollen is so small that it can drift through the holes in window and door screens. Air conditioner filters catch the pollen and prevent it from settling on surfaces in your home.

Pro Tip: 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 Michigan, that means starting treatment in mid-to-late March.

Michigan’s active spring wildlife is another factor worth noting. Insects like hawks aren’t a concern, but the emergence of caterpillars and butterflies signals the same seasonal shift that drives pollen production — a useful natural reminder that allergy season is in full swing. You can also track Michigan-specific seasonal patterns through resources like Allermi’s Michigan allergy guide to stay ahead of pollen peaks.

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

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.

Mild seasonal sneezing or occasional paw licking may not require an immediate vet visit, but there are clear situations where professional evaluation is important. You should contact your veterinarian if your dog experiences any of the following:

• Symptoms that persist or worsen — If your dog’s allergy symptoms persist or worsen despite your best efforts at home, it may be time to seek veterinary support.
• Secondary skin or ear infections — It’s easier to get itchiness under control if therapy is started early, and allergies can lead to bacterial and yeast infections in the skin and even hot spots.
• First-time symptoms in a young dog — If you are noticing any of these symptoms in your dog for the first time, it’s a good idea to set up an appointment with your vet so that a thorough exam can be performed.
• Severe or sudden reactions — Any signs of anaphylactic shock should be treated as an emergency. If your dog has swelling of the face or snout or if they are struggling to breathe, take them to receive emergency veterinary care.
• Symptoms that affect quality of life — Most affected dogs need prescription medications in order to be comfortable and prevent secondary infections, hot spots, and ear infections. Even mild allergies can have a negative effect on a dog’s well-being and quality of life when left untreated.

Key Insight: Early intervention is key to preventing complications and keeping your dog healthy and happy during the allergy season. Don’t wait for symptoms to become severe before reaching out to your vet.

Spring allergies in dogs are manageable with the right approach and professional guidance. Being proactive about your dog’s allergy symptoms and consulting with your veterinarian can make a world of difference in their comfort and quality of life.

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 currently available for canine atopy. You can also explore how dogs in other states like Arizona, California, Florida, Delaware, Colorado, and Alaska manage spring allergies for a broader picture of how climate shapes your dog’s allergy experience.