Seasonal Allergies in Dogs: Signs, Causes, and What Actually Helps

You’re finally enjoying the warm breezes and blooming trees of spring. Your dog, meanwhile,  has been licking their paws for three weeks straight and has scratched a bald patch behind their ear.

Seasonal allergies in dogs are genuinely common, genuinely uncomfortable, and often misunderstood. The signs look different from those of human allergies — no sneezing, no watery eyes (usually). Instead, dogs itch. Constantly. And that scratching and licking leads to skin damage, infections, and a miserable pet.

Here’s what’s actually going on, and what you can do about it.

Why Do Dogs Get Seasonal Allergies?

Dogs with atopy — environmental allergy — have immune systems that overreact to airborne  particles like tree pollen, grass pollen, mould spores, and dust mites. Instead of triggering the respiratory response they do in humans, these allergens cause skin inflammation in dogs.

In New Brunswick, allergy season typically ramps up in late spring as tree and grass pollen levels peak, then continues through summer and into fall. Dogs with atopy often have symptoms that are clearly seasonal — worse in spring and fall, better in winter.

Signs Your Dog Has Seasonal Allergies

The most common signs of seasonal allergies in dogs include:

• Excessive paw licking or chewing — often leaving reddish-brown saliva staining on light coloured fur.
• Recurring ear infections — head shaking, dark discharge, or scratching at the ear canal
• Red, irritated skin — particularly the belly, armpits, groin, and between the toes
• Rubbing their face on the carpet or furniture
• Watery eyes or discharge around the eyes
• Skin infections that keep coming back

If these symptoms are clearly seasonal — improving in winter, worsening in spring and fall —  environmental allergies are a strong possibility. Year-round symptoms suggest food allergy or indoor allergens, like dust mites.

The Itch-Infection Spiral

Here’s why allergies get worse so fast: scratching and licking damage the skin barrier, allowing bacteria and yeast to colonize the raw surface, which causes more itching, which causes more scratching. This cycle can go from “my dog is a bit itchy” to “my dog has a significant skin infection” within days.

Catching it early and managing the underlying allergy proactively are far easier than treating a full-blown skin infection after the fact.

What Actually Helps

Regular Bathing

Bathing rinses allergens off the skin and coat, providing real symptom relief. During peak allergy season, bathing twice a week is not excessive for a symptomatic dog. In some cases,  your vet may prescribe a medicated shampoo specifically formulated for allergic skin disease — these are significantly more effective than regular pet shampoos.

Epsom Salt Foot Soaks

During flare-ups, foot soaks help soothe itchy, inflamed paw pads and reduce the bacteria introduced by constant licking. Dissolve plain Epsom salt in warm water — no essential oils,  which can be toxic to pets — and soak your dog’s feet for 10 minutes twice daily. This is particularly helpful between vet appointments when symptoms are active.

Prescription Medications

Antihistamines help some dogs but are less reliably effective in dogs than in humans. The real  game-changers for dogs with moderate to severe atopy are:

• Cytopoint — an injectable antibody treatment that works by blocking the signal that causes itch. Effects typically last 4–8 weeks.
• Apoquel — a daily oral tablet that reduces itch and inflammation quickly. Effective for ongoing management.

Both require a prescription from your vet, but they have made a significant difference in the quality of life for many dogs with allergies.

Allergy Testing and Immunotherapy

For dogs with severe or year-round environmental allergies, allergy testing (either blood-based or intradermal skin testing) can identify specific triggers. Allergen-specific immunotherapy — a series of injections or sublingual drops tailored to your dog’s specific sensitivities — is the only option.  

treatment that actually addresses the underlying immune response rather than just managing symptoms.

When to See a Vet

Book a vet assessment if your dog:

• Has been itching consistently for more than two weeks
• Has developed a hot spot, skin infection, or visible skin changes
• Has recurring ear infections (more than one or two per year)
• Is not responding to basic management at home

If your regular vet is fully booked and your dog’s symptoms are escalating, Fredericton Veterinary Walk-in & Urgent Care can assess what’s going on and get your pet started on relief.

Seasonal allergies in dogs are manageable with the right approach. The key is recognizing the pattern early, keeping up with bathing and foot soaks during peak season, and talking to your vet about prescription options if symptoms are interfering with your dog’s quality of life. An itchy,  miserable dog doesn’t have to be the price of a New Brunswick spring.