Pet Heartworm Prevention

Heartworm disease is a serious and potentially fatal condition caused by parasitic worms transmitted through mosquito bites. At Erin Mills Pet Hospital, we emphasize regular pet heartworm prevention in Mississauga, ON, to safeguard the health of your beloved pets.

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Pet Heartworm Prevention in Mississauga, ON

Heartworm disease can progress silently; dogs may experience signs such as coughing, fatigue, weight loss, or difficulty breathing, while advanced cases can result in complications like fluid accumulation in the abdomen or caval syndrome, a critical condition affecting the liver. Cats, though less commonly affected, are also vulnerable. They may develop heartworm-associated respiratory disease (HARD), which mimics asthma or bronchitis, with symptoms including coughing, wheezing, vomiting, and loss of appetite.

The Importance of Prevention

Preventing heartworm disease is far more manageable than treating it. Treatment for dogs is costly, lengthy, and comes with significant risks, while there is no approved treatment for cats. Infected cats may spontaneously clear the infection, but others may succumb to its effects. Even a single adult heartworm can cause severe problems in cats.

Fortunately, prevention is straightforward and effective. Monthly heartworm preventives are available in oral, topical, or injectable forms, offering reliable protection against infection. Many of these medications also guard against additional parasites like fleas, ticks, and intestinal worms, providing comprehensive care in one convenient treatment.

hand feeding dog and treat from heartworm

When to Consider Heartworm Prevention

Heartworm prevention should be a year-round commitment, as mosquitoes can survive indoors even during colder months. It is especially crucial if your pet spends time outdoors or in areas where mosquitoes are common. Annual heartworm testing is also recommended, as early detection of infection can prevent complications and guide treatment decisions.

Protect Your Pet with Heartworm Prevention

At Erin Mills Pet Hospital, we offer tailored prevention plans to meet your pet’s specific needs. Our team is happy to recommend the most suitable regimen to keep your pet safe from heartworm disease and other parasites. Protecting your pet from this preventable illness ensures a healthier, happier life for years to come.

For more information about pet heartworm prevention in Mississauga, ON, or to schedule an appointment, please contact our team. We are here to help you provide the best care for your pet.

Frequently Asked Questions About Pet Heartworm Prevention

How exactly do dogs and cats catch heartworms?

Heartworms are transmitted exclusively through the bite of an infected mosquito. When a mosquito bites an infected animal, it picks up microscopic worm larvae. When that same mosquito bites your pet, it injects those larvae into the bloodstream. Over several months, these larvae migrate to the heart, lungs, and surrounding blood vessels, where they grow into adult worms up to a foot long, causing severe organ damage.

Why does my dog need a blood test every year before getting heartworm medication?

Administering prevention to a dog with an existing infection can increase the risk of serious complications, which is why annual testing is recommended. The medication can cause a sudden breakdown of microscopic larvae in the bloodstream, triggering a severe, life-threatening shock reaction. Annual testing ensures your dog is negative before safely starting their seasonal or year-round preventative regimen.

Do I really need to give heartworm prevention during the cold Ontario winter months?

While the risk drops significantly when temperatures fall below freezing, the American Heartworm Society recommends year-round prevention. Climate shifts mean unpredictable warm spells can cause mosquitoes to emerge early or survive later into the season. Furthermore, mosquitoes easily seek shelter inside warm houses, garages, and crawlspaces where they can remain active and bite indoor pets mid-winter.

If my cat stays completely indoors, do they still need heartworm prevention?

Yes, absolutely. Studies show that roughly 25% of all heartworm-positive cats are described by their owners as strictly indoor pets. Mosquitoes frequently slip inside houses through open doors, torn window screens, or on clothing. Because cats have small hearts and airways, even a single adult heartworm can be fatal, and unlike dogs, there is no approved medical treatment to cure heartworms in cats.

What is the difference between heartworm prevention and heartworm treatment?

Prevention is simple, safe, and inexpensive—it uses monthly chewables, topical liquids, or an injection to kill microscopic larvae before they can grow into adults. Treatment, on the other hand, is only available for dogs and is an intensive, costly, and painful multi-month medical process. It requires a series of deep muscle injections containing arsenic-based compounds to kill the adult worms, during which the dog must be kept under strict cage rest to prevent complications from dying worms.