What’s Lurking This Spring: A Practical Guide to Allergies, Ticks, and Heartworm in Maine Pets

Spring in Maine brings longer days, warmer air, and a welcome return to the outdoors. For pets, it often means more time outside, more activity, and more exposure to the environment. It also marks the start of a season when several health risks begin to rise at the same time.

Three in particular stand out this year: allergies, ticks, and heartworm.

Allergies Are on the Rise

Seasonal allergies in pets are becoming more common. Changes in temperature, pollen levels, and environmental conditions are likely contributing factors. Unlike people, pets often show allergy symptoms through their skin and ears rather than just their respiratory system.

Common signs include:

• Itchy skin or constant scratching

• Licking or chewing at paws

• Red or irritated ears

• Head shaking or recurring ear infections

These symptoms may start mild but can quickly progress if left untreated. Early intervention helps prevent secondary infections and keeps pets more comfortable as the season progresses.

Tick Exposure Is Higher Than Ever

Tick populations in Maine continue to expand, and this season is proving especially active. Pets that spend time outdoors, even in backyards, are at risk.

Ticks are more than a nuisance. They can transmit diseases such as Lyme disease, which is now widespread in the region. While many pets are on flea and tick preventatives, these medications reduce risk but do not eliminate it entirely.

That is why a layered approach to prevention is often recommended. This includes:

• Year round flea and tick preventatives 

• Lyme vaccine for dogs 

• Daily tick checks after outdoor activity

Ticks can be small and difficult to detect, especially in thick fur. A quick check at the end of the day can make a meaningful difference, and help decrease transmission of  tick-borne illnesses to both you and your pet. 

Heartworm Is No Longer Just a Southern Problem

Heartworm disease has traditionally been associated with warmer climates, but it is becoming more relevant in northern states, including Maine.

Heartworm is caused by parasitic worms that live in the heart, lungs, and blood vessels of infected animals. It is spread by mosquitoes. When a mosquito bites an infected dog, it can pick up microscopic larvae. When that mosquito bites another dog, it can pass those larvae along, starting a new infection.

Once inside the body, the larvae mature over several months into adult worms. This is an important detail because it means a dog can test negative shortly after exposure, then test positive months later once the worms have matured.

As the disease progresses, heartworms can interfere with normal heart and lung function. In more advanced cases, dogs may develop coughing, fatigue, weight loss, or difficulty breathing.

Treatment is possible, but it is not simple. It typically involves:

• A series of injections to kill adult worms

• Medication to eliminate immature stages

• Strict rest for several weeks or months to reduce the risk of complications

During treatment, as worms die, they can break apart and travel through the bloodstream, which can lead to inflammation or blockages in the lungs. Because of this, activity must be tightly controlled.

The key takeaway is that heartworm is far easier to prevent than to treat. Preventative medications work by eliminating immature larvae before they develop into adult worms. These are given monthly and are highly effective when used consistently. The American Heartworm Society and at Vet At Your Door, recommend you give your heartworm prevention every month, year round. It is no longer recommended to discontinue preventatives in the colder months. 

Even in areas where heartworm has been less common, prevention is becoming more important due to increased travel, relocation of pets, and shifting mosquito patterns.

A Season for Prevention and Awareness

Spring is a time of renewed activity, but it is also a time to reset preventive care. Allergies, ticks, and heartworm each require attention, and each is easier to manage when prevented and addressed early.

A thoughtful plan that includes prevention, observation, and regular communication with a veterinary team can help ensure pets stay healthy through the season. Small steps taken now can prevent larger problems later and allow pets to fully enjoy everything that spring in Maine has to offer.

Check out Vet at Your Door's online store for a full complement of preventatives.