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Spring Has Sprung… and So Have the Parasites!

3/19/2026

 
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Your Guide to Flea, Tick, and Heartworm Prevention for Dogs and Cats

Spring in New England means longer walks, muddy paws, blooming flowers, and unfortunately, blooms of fleas, ticks, mosquitos, and other parasites that can make life miserable for pets and their families.

As the weather warms up, parasites become active again. At Concord Animal Hospital, spring is when we see a big increase in flea infestations, tick-borne diseases, and heartworm prevention questions.

The good news? With the right parasite prevention plan, you can keep your dog or cat protected all season long.

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Why Parasites Are a Big Deal for Pets

Parasites aren’t just annoying, they can cause serious health problems for both dogs and cats.

Common parasites we see every spring include:
  • Ticks, which can transmit Lyme disease and other infections
  • Fleas, which cause itching, skin infections, and tapeworms
  • Heartworms, which can damage the heart and lungs
  • Intestinal parasites, such as roundworms and hookworms

Some of these parasites can even affect people, making pet parasite prevention important for the whole family.


Tick Season Is Actually All Year Long!

Many pet owners assume ticks are only a summer problem. In reality, ticks become active as soon as temperatures rise above freezing. This happens at least monthly even in the winter.

In Massachusetts and throughout New England, we commonly see:
  • Deer ticks (which transmit Lyme disease)
  • Dog ticks
  • Lone star ticks, which are becoming more common in our area

Ticks often hide in tall grass, wooded trails, leaf piles, and even suburban backyards, so pets can pick them up during everyday walks.

Using year-round tick prevention for dogs and cats is the best way to reduce risk.

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Fleas: Tiny Parasites, Big Headaches

Fleas are masters of survival. Once they enter your home, they can quickly multiply in:
  • Carpets
  • Furniture
  • Bedding
  • Floor cracks

One flea on your pet can turn into hundreds within weeks.

Signs of fleas include:
  • Excessive scratching or biting
  • Hair loss
  • Small black specks (“flea dirt”) in the coat
  • Skin irritation or scabs

Preventing fleas is far easier than eliminating a full flea infestation in your home.


Heartworm Disease: The Hidden Danger

Heartworms are spread by mosquito bites, and infected pets may not show symptoms until the disease is advanced.
In dogs, heartworm disease can lead to:
  • Chronic coughing
  • Exercise intolerance
  • Heart and lung damage

Cats can also develop heartworm infections, which may cause sudden respiratory issues or vomiting.

The safest approach is monthly heartworm prevention, which protects pets before infection can occur.

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Do Indoor Pets Need Parasite Prevention?

Yes!

Even pets that spend most of their time indoors can be exposed to parasites. Fleas and ticks can hitch a ride inside on:
  • Clothing
  • Other pets
  • Visitors
  • Wildlife near your home

Mosquitoes carrying heartworm disease can also enter homes easily.

That’s why veterinarians recommend consistent parasite prevention for both indoor and outdoor pets.


The Best Parasite Prevention for Your Pet

Today’s veterinary parasite preventatives are safer, more effective, and easier to use than ever.

Depending on your pet’s lifestyle and health needs, we may recommend:
  • Monthly or every 12 week chewable tablets
  • Topical flea and tick treatments, mostly for cats
  • Long-lasting tick protection, including injectable options

During your pet’s annual exam, your veterinarian can recommend the best flea, tick, and heartworm prevention plan for your dog or cat.

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Spring Pet Care Tips

To help reduce parasite exposure this spring:
✔ Use year-round parasite prevention
✔ Check pets for ticks after walks or hikes
✔ Stay current on heartworm testing for dogs
✔ Bring pets in for regular veterinary exams

A little prevention now can save a lot of discomfort—and veterinary visits—later.


Protect Your Pet This Spring

Spring should be about long walks, sunny naps, and outdoor adventures, not scratching and parasites.

If you’re unsure whether your pet is protected, our team at Concord Animal Hospital is happy to help you choose the safest and most effective parasite prevention for dogs and cats.

📞 Call us today to schedule your pet’s spring wellness visit or write to ask about the best flea, tick, and heartworm protection options.

Your pet will thank you!


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Concord, MA 01742
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Photos from marcoverch, Katell Ar Gow, Bennilover, dangaken, michaeljoakes, Nenad Stojkovic (CC BY 2.0), mripp, Clara S., odonata98 (Kimberly Reinhart), Wha'ppen, marc falardeau
  • Contact Us
  • Services
    • Preventative Care
    • Surgical Care
    • Laparoscopic Surgery
    • Dental Health
    • End of Life Care
    • Emergency Services & Resources
    • Grooming
    • Acupuncture & Laser Therapy
    • Laser Therapy
    • Moving or Traveling with Your Pet
  • About Us
  • Blog
  • Pharmacy
    • In-House Pharmacy
    • Online Pharmacy
  • Resources
    • How-To Videos
    • Fleas, ticks and heartworm
    • Microchipping
    • Make your pet love the vet!