Heartworm, Fleas, and Ticks: The Parasite Prevention Conversation Every Colorado Springs Dog Owner Should Have

“We’re in Colorado, do we really need heartworm prevention?” is a question we hear often enough that it’s worth answering plainly: yes. Heartworm disease has been diagnosed in dogs in every U.S. state, and fleas and ticks don’t check a calendar before they become a problem. This is one of the most preventable categories of serious illness we treat — and one of the most expensive and dangerous once prevention has failed.

Three Parasites, One Conversation

Heartworm, fleas, and ticks get grouped together because the products that prevent them often overlap, but the diseases themselves are very different. Heartworms are spread exclusively by mosquito bites and attack the heart and lungs. Fleas cause skin irritation, allergic reactions, and can transmit tapeworms. Ticks, increasingly common along the Front Range, carry Lyme disease, ehrlichiosis, and other serious infections that can cause fever, joint pain, and organ damage.

How Heartworm Disease Progresses

A mosquito carrying immature heartworm larvae bites your dog, and over about six to seven months those larvae mature into adult worms living in the heart and pulmonary blood vessels — worms that can grow up to a foot long, with a single dog capable of harboring dozens. Early infection often shows no symptoms at all. As the disease progresses, dogs develop a soft cough, fatigue after mild activity, and weight loss; in advanced cases, heart failure and a life-threatening condition called caval syndrome can develop, sometimes leading to sudden collapse.

Why Fleas Are More Than a Nuisance

Beyond the obvious itching, a flea infestation can trigger flea allergy dermatitis, an intensely itchy skin reaction to flea saliva that can cause hair loss, hot spots, and secondary skin infections. Fleas also serve as an intermediate host for tapeworms, meaning a dog that swallows an infected flea while grooming can pick up an intestinal parasite in the process.

Ticks and Colorado’s Changing Risk

Tick populations along the Front Range have been expanding, and disease transmission can begin within hours of a tick attaching. Regular checks after outdoor time, especially around ears, between toes, and in the armpits, catch ticks before they’ve had time to transmit disease. Removing a tick promptly is one of the simplest things an owner can do to reduce risk.

When Prevention Has Already Failed

If your dog tests positive for heartworm, treatment involves a multi-stage protocol: a monthly heartworm preventive and 28 days of doxycycline to weaken the worms, followed by a series of melarsomine injections spaced over about two months to kill the adult worms, with strict exercise restriction throughout to avoid dislodging worm fragments into the lungs. It’s an intensive, expensive process that heartworm prevention entirely avoids — which is why annual testing matters even for dogs who are already on a preventive, since no product is 100 percent foolproof if a dose is ever missed.

Building a Year-Round Plan

The American Heartworm Society recommends year-round heartworm prevention with annual testing for every dog, in every state. Many products combine heartworm, flea, and tick coverage into a single monthly chewable or topical, and some newer options extend coverage for months at a time. If your dog isn’t currently on a consistent parasite prevention plan, that’s a conversation worth having at your next visit — before mosquito, flea, or tick season catches you unprepared.

When Every Minute Counts

North Springs Veterinary Emergency & Specialty Center is open 24 hours a day, 7 days a week, 365 days a year. No appointment is ever needed for an emergency — walk in any time, day or night. Our team works alongside in-house specialists in surgery, internal medicine, cardiology, and radiology, so your pet can move seamlessly from emergency stabilization to specialty care under one roof.

North Springs Veterinary Emergency & Specialty Center

10520 White Diamond Pt, Colorado Springs, CO 80908

Phone: (719) 920-4430

northspringsvrc.com

Sources

1. Heartworm in Dogs — American Heartworm Society. https://www.heartwormsociety.org/heartworms-in-dogs
2. Heartworm disease — American Veterinary Medical Association. https://www.avma.org/resources-tools/pet-owners/petcare/heartworm-disease
3. Heartworm Disease in Dogs: Symptoms, Causes and Treatment — PetMD. https://www.petmd.com/dog/conditions/infectious-parasitic/heartworm-disease-in-dogs
4. Guidelines for canine heartworm disease are updated — dvm360. https://www.dvm360.com/view/guidelines-for-canine-heartworm-disease-are-updated
5. Heartworms in Dogs: Symptoms, Prevention, and More — Chewy. https://www.chewy.com/education/dog/health-and-wellness/heartworms-in-dogs-signs-treatment-and-prevention