Heartworm FAQs at Fremont Pet Hospital, Your Chiropractor Near You in Fremont, CA

Heartworm disease is a hidden danger that can feel like it suddenly shows up without warning. It spreads quietly through mosquito bites, and by the time signs appear, it can already be serious. At Fremont Pet Hospital, your veterinarian in Fremont, CA, we get a lot of questions about heartworms—how pets get them, how to prevent them, and what happens if they test positive:

What Is Heartworm Disease?

Heartworm disease is caused by a parasite called Dirofilaria immitis. It spreads when a mosquito carrying microscopic larvae bites an animal. Over several months, the larvae grow into adult worms that live in the heart, lungs, and blood vessels. These worms can cause lung disease, heart failure, and damage to major organs if left untreated.

Can Both Dogs and Cats Get Heartworms?

Yes, but dogs are more likely to develop full-blown heartworm disease. They are a natural host for the worms, which means the parasites can mature and reproduce in their systems. Cats are less commonly infected, but when they are, the condition can cause serious problems.

What Are the Signs of Heartworm Infection?

In dogs, the early stages often have no visible symptoms. As the disease progresses, you might notice:

•             Coughing

•             Fatigue after moderate activity

•             Loss of appetite

•             Weight loss

•             Swollen belly from fluid buildup

Cats may show signs like coughing, vomiting, or sudden collapse. Sometimes, the first sign is unfortunately the last—sudden death can occur in severe feline cases.

How Do You Test for Heartworms?

A simple blood test can tell us if your pet has heartworms. We recommend annual testing, even if they’re on a preventive. This helps catch any infections early, especially if a dose was missed or if the medication didn’t work as expected.

Is Heartworm Preventable?

Yes. Monthly preventives—given by mouth, topically, or by injection—are very effective at stopping infection before it starts. These medications work by killing the heartworm larvae before they grow into adults. Prevention is far safer, easier, and less expensive than treatment.

What If My Pet Tests Positive?

If your pet tests positive, we’ll recommend a treatment plan that may include antibiotics, anti-inflammatory medication, and injections to kill the worms. The process takes several months and requires strict rest. For cats, there is no approved treatment and the heartworms are almost certain to be fatal, making prevention vital.

Get Heartworm Treatment from a Veterinarian Near You

At Fremont Pet Hospital, your veterinarian in Fremont, CA, we believe in staying ahead of health problems whenever possible. Heartworm disease is serious, but it’s also preventable with regular testing and medication. We’re here to help your pet friends stay healthy and safe. Call us at (510) 651-3960 for heartworm treatment from a veterinarian near you.