Rocky Mountain Spotted Fever in Ontario- What Pet Parents Need to Know

If you’re like us, you love exploring Ontario’s trails, forests, and campgrounds with your pet(s) by your side.

However, enjoying nature also means being aware of and familar with the risks you may face along the way.

You’ve probably heard about Lyme disease, the tick-borne illness that has long been a known concern in Ontario. What you may not know is that there is another serious illness starting to pop up in places it didn’t used to be in our province, making headlines – Rocky Mountain Spotted Fever.

I’m obviously not here to scare anyone away from the outdoors. Quite the opposite.

I want to help you safely enjoy your adventures and make memories with your pet. This means taking steps to keep them safe.

In this article, we will discuss how Rocky Mountain Spotted Fever spreads, what symptoms to look for in your dog or cat, and how to protect them so you can continue adventuring with peace of mind.

Let’s get started…

What is Rocky Mountain Spotted Fever (RMSF)?

Rocky Mountain Spotted Fever, often shortened to RMSF, is a serious bacterial disease caused by tiny organisms called Rickettsia rickettsii.

This bacterium is spread through the bite of an infected tick, similar to Lyme disease.

One of the reasons RMSF is so dangerous, especially for pets, is how quickly it escalates.

After the initial tick bite (transmission), the bacteria infect the lining of a pet’s blood vessels, causing inflammation. This quickly impacts multiple essential organs.

Without quick treatment, RMSF can be life-threatening.

All of that is scary to read as a loving pet parent. BUT there is some good news… RMSF is treatable, especially when caught early.

What Makes RMSF Different from Other Tick-Borne Diseases?

As I mentioned, this isn’t the first tick-borne disease we have had to be aware of in Ontario. In fact, most outdoor-loving pet parents are very familiar with the risks of Lyme disease.

Here are a few things that make RMSF different:

• It can cause rapid-onset symptoms (including severe symptoms) in pets, often within just days of exposure.
• It doesn’t always come with a visible rash like it can in humans, making it harder to spot.
• It’s caused by a different species of bacteria than Lyme disease, so treatment and progression can be significantly different.

While RMSF is still relatively rare in Ontario, the risk is real (and rising), especially for pets who spend time in natural areas where the carrier ticks thrive.

That’s why awareness is so important, even if your vet hasn’t mentioned the disease (yet).

Can Pets in Ontario Really Get Rocky Mountain Spotted Fever?

The short answer? Yes.

I know the name can be misleading. After all, we hear “Rocky Mountain” and instantly think of the beautiful mountain range in Alberta and BC.

RMSF has traditionally been seen as a disease of the southern U.S., but is no longer limited by geography.

Veterinarians in the Long Point area are currently making headlines, warning about the disease, with 5 cases being reported in the last month, including at least 1 life lost.

In fact, tick-borne illnesses in general are on the rise across Canada, and RMSF is part of that concerning trend.

The cases here in Ontario are rare enough that many pet parents (and even some vets) may not yet have it on their radar.

That’s changing with the impact of climate shifts, wildlife migration, and human travel patterns, allowing tick populations to expand into new areas (including, potentially, your backyard).

The main culprit for spreading RMSF is the American dog tick, a species already widely established here in Ontario!

While not all dog ticks are infected, the ones that are can pass the bacteria quickly (within just 3 to 6 hours of attachment, according to some experts).

This means that even a casual day trip can turn into something much more serious if you don’t take steps to keep your pet safe.

How RMSF Spreads to Pets (and Humans)

The American dog tick, the primary culprit for spreading RMSF, is active from early spring through fall, especially in grassy, brushy, or wooded areas.

Aka the spaces our pets generally love to explore.

Here’s how the cycle works:

1. A tick feeds on an infected wild animal (like a raccoon or rodent).
2. The tick picks up the RMSF-causing bacteria.
3. Later, it bites your dog or cat, passing the bacteria into their bloodstream.
4. Symptoms of RMSF develop and worsen over time unless treated.

Yes, It Can Be Transferred to People, But Not the Way You Might Think

You CAN get RMSF from the same ticks that infect your pets, but not directly from your pet.

You’re both at risk from shared environments. If your pet has ticks, it’s a sign that you could be exposed, too.

There is also a secondary risk to consider: ticks your pet brings inside (including into your tent or RV) may crawl off and bite a human family member later.

This is one of the many reasons regular tick checks and preventatives are so important for everyone in the household – furry or otherwise.

Recognizing the Symptoms of Rocky Mountain Spotted Fever in Pets

One of the biggest challenges with RMSF is how nonspecific the symptoms can be, especally in the early stages.

It can look like a mild illness at first, but it can escalate quickly if left untreated.

Some pets show no signs at all, while others may develop a mix of the following:

• Fever (often high and persistent)
• Lethargy or reluctance to move
• Loss of appetite
• Lameness, stiffness, or painful joints
• Swollen lymph nodes
• Vomiting or diarrhea
• Nosebleeds or bleeding under the skin (may appear as bruising or red/purple spots)
• Eye issues like redness or discharge
• Neurological symptoms such as unsteadiness, head tilt, or seizures in severe cases

Cats are less likely to be diagnosed with RMSF, but they can still get it, and the symptoms tend to mirror those in dogs.

Why Early Detection Matters

The earlier RMSF is caught, the better the outcome.

Left untreated, it can lead to serious or life-threatening complications like organ damage or clotting issues.

This is not a “wait and see” kind of illness. If your pet shows these symptoms after a tick bite or time outdoors, call your vet immediately.

How Rocky Mountain Spotted Fever is Diagnosed

If your pet starts showing unusual symptoms after spending time outdoors, especially in a tick-prone area or somewhere where cases are being reported, it’s important to act quickly.

While many RMSF symptoms can look like other illnesses, your vet will use a combination of your pet’s medical history, a physical exam, and diagnostic testing to figure out what’s going on.

When you bring your dog or cat in, your vet may ask:

• Have you recently been hiking, camping, or in tall grass?
• Have you found any ticks on your pet (or yourself)?
• When did the symptoms start, and how have they progressed?

These questions will help them decide which tests are needed.

To diagnose RMSF, vets typically rely on blood testing to check for:

• Low platelets
• Anemia
• Elevated white cells
• Liver or kidney concerns
• Antibodies to Rickettsia ricketsii

Some advanced vet clinics or labs may use PCR (polymerase chain reaction) to detect the DNA of the bacteria itself.

Treatment and Recovery for Pets with Rocky Mountain Spotted Fever

The good news? With prompt treatment, most pets recover well from RMSF.

But timing is everything! This is a disease where waiting can make a serious (and potentially life-ending) difference.

Because RMSF can progress so quickly, many vets won’t wait for test results before starting treatment, especially if your pet has a history of recent tick exposure and/or shows classic symptoms.

First Line Treatmnet: Doxycycline

The go-to antibiotic for RMSF in both dogs and cats is doxycycline.

It’s typically prescribed in oral form for a minimum of 2-3 weeks, even if symptoms improve quickly. Although IV treatment may be used in severe cases.

Never stop antibiotics early, even if your pet seems fine. Cutting treatment short may lead to a relapse or hinder their recovery.

Doxycycline is generally well-tolerated but can cause stomach upset, especially if given without food. This is why it is often recommended to give it with a small meal to reduce the risk.

Supportive Care

Depending on the severity of your pet’s illness, they may also require supportive care throughout the treatment stage.

This may include:

• IV fluids to stay hydrated
• Anti-nausea or appetite-stimulating meds
• Pain relief or fever reducers
• Hospitalization for more intensive monitoring and care in critical cases

What Recovery Looks Like

Most pets with mild cases will show improvement in 24-48 hours after starting doxycycline.

If you are dealing with a more severe case, it may take several weeks and require follow-up visits or blood work.

Pets with neurological symptoms or organ damage may need longer-term care or rehab.

Can pets fully recover? Yes, if treated early. Most dogs and cats bounce back completely.

However, delayed treatment can lead to ongoing mobility issues, organ damage, or, in rare cases, death. Time is of the essence.

Prevention Tips for Outdoor-Loving Pets

When it comes to Rocky Mountain Spotted Fever, prevention is key.

Ticks may be small, but the risk they carry can be serious and in some cases, life-threatening.

The good news? A few simple habits can go a long way in keeping your pets safe while enjoying the great outdoors!

Use Year-Round Tick Prevention

Tick activity in Ontario often starts earlier and lasts longer than many people realize.

Even in spring or late fall, temperatures can rise just enough for ticks to become active.

That’s why many veterinarians recommend keeping pets on tick prevention all year, especially those who hike, camp, or travel often (as we do with ours).

Speak with your vet about the best options for your dog or cat.

Prescription preventatives, whether topical or oral, are far more effective than over-the-counter products. That’s why we opt for that solution.

However, there are many natural products you may wish to explore.

If you’re a multi-species household (like we are), make sure you’re using the right pet-specifc treatments. We use different products on our cats than we do our dogs.

Never use a product designed for dogs on your cat.

Some dog-only products contain ingredients like permethrin, which is highly toxic to cats. Even a small exposure can be dangerous.

Do Thorough Tick Checks After Every Outing

One of the simplest and most effective steps you can take is to check your pet for ticks after every hike, campsite potty break, or outdoor exploration.

Ticks like to hide in warm, hidden areas like between the toes, under the collar, around the ears, or along the belly and tail.

Use your hands to feel for small bumps and part the fur for a better look, especially if your pet has a thicker coat.

If you find a tick, remove it with a tick removal tool, like the Tick Key (our go-to), or with fine-point tweezers.

Grasp the tick as close to the skin as possible and pull straight out, slowly and steadily. Do NOT twist.

Avoid home remedies like smothering the tick with essential oils or vaseline, as that can increase the risk of infection.

Make Smart Trail and Campsite Choices

Not all trails are equal when it comes to tick exposure.

Ticks love tall grasses, leaf litter, and dense underbrush. So, sticking to wide, well-maintained trails can significantly lower your pet’s chances of picking one up.

When choosing a campsite, opt for areas where the grass is mowed and brush is cleared back from paths, site clearings, or tent pads.

I can’t stress enough the importance of being extra diligent with prevention and post-adventure checks!

Consider Tick-Repelling Gear

Some pet gear is designed to help keep ticks away.

Tick-repellent bandanas, vests, and protective clothing can act as an extra barrier when adventuring, especially for dogs or cats who love checking out the brush.

Remember that not all gear is safe for all pets.

For example, permethrin-treated clothing should never be used on or near cats, as even indirect contact can be harmful.

Additionally, not all (or any) tick-repellent gear should be viewed as a complete solution. These products should be part of a bigger prevention plan.

Staying Safe Without Skipping the Adventure

Rocky Mountain Spotted Fever may sound frightening (and it is a serious illness) but with the right precautions, you don’t have to give up your lifestyle of outdoor adventures with your pets.

Whether you’re hiking forest trails, camping in provincial parks, or just exploring the woods in your own backyard, being prepared makes all the difference.

Tick prevention, regular checks, and smart trail choices are all simple steps that will help keep your dogs and cats safe.

After all, they love the wilderness just as much as we do, and they count on us to keep them happy and healthy while they enjoy it.

Do you have any questions, tick-related experiences, or favourite tick-safe trails to recommend? Share with our pet-loving community in the comments!

FAQs

Can cats get Rocky Mountain Spotted Fever, or is it just a concern for dogs?

Yes, cats can get RMSF, although it’s less common than in dogs. Symptoms may include fever, lethargy, loss of appetite, and swollen lymph nodes.

Prevention and regular tick checks are essential, especially on outdoor explorers.

Are some dog or cat breeds more at risk for severe symptoms of Rocky Mountain Spotted Fever?

There is no strong evidence that breed alone affects how severe your pet’s infection may be. However, senior pets, very young animals, and those with a compromised immune system may struggle more with RMSF.

It’s a good idea to talk to your vet for more personalized tips if they are in a higher-risk group.

Can my pet give me Rocky Mountain Spotted Fever?

Your pet can’t directly transmit RMSF to you, but ticks can.

If a tick crawls from your pet to you or bites you after detaching from your dog or cat, you’re at risk.

This is why tick prevention protects the whole household, not just your pet!

What should I do if I find a tick on my pet and I’m not sure how long it’s been attached?

Safely remove the tick as soon as possible using a tick key tool or fine-tipped tweezers. Monitor your pet for symptoms over the next two weeks.

If the tick was engorged or symptoms develop, contact your your vet ASAP.

Is Rocky Mountain Spotted Fever only a concern in the summer?

Ticks can be active in Ontario from early spring through late fall, and even during mild winter thaws.

RMSF risk is tied to tick activity, not just hot weather, so prevention should be part of your routine in many areas of the province year-round.