Heartworm Prevention for Dogs
- Beth K.
- Mar 30
- 2 min read
Updated: Apr 15
Understanding Heartworm Disease in Dogs
Heartworm disease is a serious and preventable condition that affects dogs across the United States, including here in Michigan. Understanding how it spreads, what signs to watch for, and how to protect your pet can make a significant difference in their long-term health.
What Is Heartworm Disease?
Heartworm disease is transmitted by mosquitoes. When a mosquito bites an infected animal and then bites your dog, it can transfer microscopic larvae into your pet’s bloodstream.
These larvae travel through the body and eventually settle in the heart and lungs, where they mature into adult worms. Male heartworms can grow up to 10 to 12 inches long, while females can reach up to 6 inches.
As these worms grow, they can cause inflammation and scarring within the heart and lungs, making it harder for the heart to function properly.
Why Heartworm Disease Is Serious
Heartworm disease can lead to significant health complications if left untreated, including:
Heart disease
Lung damage
Heart failure
Spread of disease to other organs
In severe cases, it can be fatal.
One of the most concerning aspects is that damage can begin before any visible symptoms appear.
Signs to Watch For
Early detection can be difficult, but some common warning signs include:
Persistent cough
Shortness of breath
Fatigue or decreased activity
Difficulty exercising
Swollen abdomen
Weight loss
If you notice any of these symptoms, it is important to contact your veterinarian promptly.
Treatment vs. Prevention
While treatment for heartworm disease is available, it can be:
Costly
Time-intensive
Physically demanding on your dog
Because of this, prevention is always the best approach.
Today, heartworm prevention is recommended year-round rather than seasonally. Michigan’s milder winters have extended mosquito activity, increasing the risk of exposure.
Preventive options include:
Monthly medications
Combination products that also protect against fleas and ticks
Separate parasite prevention plans based on your dog’s needs
Your veterinarian can help you choose the right option for your pet.
Do Indoor Dogs Need Prevention?
Yes.
Even dogs that spend most of their time indoors are still at risk. Mosquitoes can enter homes, which means any dog can be exposed regardless of lifestyle.
Why Annual Testing Still Matters
Even if your dog is on year-round prevention, annual heartworm testing is still recommended.
This is because:
No prevention method is 100 percent foolproof
Doses can occasionally be missed
Pets may not always ingest medication fully
Even a short lapse in prevention can create an opportunity for infection. Regular testing helps ensure your dog remains protected and allows for early intervention if needed.
Protecting Your Dog Long-Term
Heartworm disease remains a real concern in Michigan due to climate changes and mosquito exposure.
With consistent prevention and routine testing, we can greatly reduce the risk and help keep your dog healthy, comfortable, and protected for years to come.
Have Questions About Heartworm Prevention?
If you have questions about heartworm prevention or want to make sure your dog is protected year-round, our team is here to help. Call us at 734-761-7523 to schedule your pet’s visit.