Spring Allergy Season: Pets Get It Too

Every spring, millions of Californians reach for the antihistamines. The state’s explosive wildflower blooms, towering oaks, and sprawling grass fields produce some of the highest pollen counts in the country, and the season seems to arrive earlier each year. What many pet owners do not realize is that their dogs and cats are suffering right alongside them.

Pets experience seasonal allergies more often than most people expect. Unlike humans, whose allergies tend to show up as sneezing and watery eyes, dogs and cats usually react through their skin. If your pet has been scratching more than usual between February and June, allergies may be the reason.

What Triggers Pet Allergies in California?

California’s geography creates something of a perfect storm for allergic animals. Tree pollen, particularly from oaks, ashes, and junipers, tends to peak between February and April across much of the state. Grass pollen follows from April through June, and in the Central Valley, agricultural dust and mold spores compound the problem well into summer.

Pets encounter these allergens differently than we do. While humans inhale pollen and react in the sinuses and airways, dogs and cats absorb allergens directly through their skin. A walk through a grassy park, a roll in the yard, or even a breeze through an open window can be enough to set off a reaction.

Recognizing the Symptoms

The hallmark of seasonal allergies in pets is itching. Dogs may scratch at their ears, chew their paws, or rub their faces against furniture and carpet. You might notice redness between the toes, around the eyes, or on the belly. Some dogs develop recurring ear infections that seem to clear up and then return every few weeks.

Cats can be subtler. They may over-groom to the point of creating bald patches, particularly along their flanks and abdomen. Small, crusty bumps along the neck and back, sometimes called miliary dermatitis, are another common sign. Cats may also develop watery eyes or sneeze more than usual, though skin symptoms are still the most reliable indicator.

Watch for these patterns in particular:
A pet that was perfectly comfortable through the winter but starts scratching in early spring is a strong candidate for environmental allergies. If the itching resolves in fall and returns the following spring, that seasonal pattern is telling you something important.
Secondary infections are also worth noting. Constant scratching damages the skin barrier, which allows bacteria and yeast to take hold. If your pet’s skin looks darkened, thickened, or greasy, or if you notice a musty odor, an infection has likely developed on top of the underlying allergy.

Treatment Options

Managing pet allergies usually involves a combination of approaches. There is no single cure, but most animals can be kept comfortable with a thoughtful plan.

Reducing exposure is the simplest first step. Wiping your dog’s paws and belly with a damp cloth after outdoor time removes pollen before it has a chance to be absorbed. Bathing with a gentle, veterinary-approved shampoo once a week can also help. Keep windows closed on high pollen days, and wash pet bedding frequently in hot water.

Over-the-counter antihistamines such as cetirizine or diphenhydramine can provide mild relief for some dogs. However, the dosing is different from what you would take, and not every antihistamine works the same way in animals. Always consult your veterinarian before giving any medication, as some formulations contain ingredients like xylitol or pseudoephedrine that are toxic to pets.

Prescription therapies have improved considerably in recent years. Apoquel (oclacitinib) targets the itch signal directly and works quickly for many dogs. Cytopoint is an injectable option that blocks a key protein involved in the itch cycle and can provide relief for four to eight weeks per injection. Both require a veterinary prescription and monitoring, but they have changed the quality of life for countless allergic dogs.

For cats, treatment options are more limited. Corticosteroids remain a common choice, though long-term use carries risks. Your veterinarian can help weigh the benefits against potential side effects.

Immunotherapy, or allergy shots, is the only treatment that addresses the root cause rather than managing symptoms. After allergy testing identifies the specific triggers, a custom serum is formulated and administered over months to gradually desensitize the immune system. It requires patience, as results typically take six to twelve months, but success rates are encouraging, particularly for younger animals.

When to See Your Veterinarian

Mild, occasional scratching during pollen season may not require a clinic visit. But certain signs should prompt you to make an appointment sooner rather than later.

If your pet is losing sleep from scratching, developing raw or bleeding skin, shaking their head frequently, or producing discharge from the ears, a veterinary evaluation is warranted. Chronic ear infections in dogs are one of the most commonly missed signs of underlying allergies, and treating the ears alone without addressing the allergy means the infections will keep coming back.

Pets that have been scratching for more than two or three weeks without improvement also deserve professional attention. The longer allergies go unmanaged, the more likely secondary infections become, and those infections require their own course of treatment.

Your veterinarian may recommend allergy testing, a food elimination trial to rule out dietary causes, or a skin scraping to check for parasites that can mimic allergy symptoms. In California, flea allergy dermatitis is extremely common and can look identical to environmental allergies, so year-round flea prevention is essential before assuming pollen is the sole culprit.

A Final Word

Seasonal allergies are frustrating, but they are manageable. The earlier you recognize the signs and work with your veterinarian to develop a plan, the more comfortable your pet will be through California’s long pollen season. A little vigilance in spring can spare your dog or cat months of misery, and spare you the heartache of watching them suffer through it.