Blastomycosis in Northern Illinois: What Pet Owners Should Know
Living around Huntley where there are nearby lake communities, wooded
neighborhoods, and newer subdivisions ( even) Del Webb Sun City—you may have
heard more talk recently about blastomycosis in dogs.
We want to take a moment to explain what this is, why we’re seeing more of it in our
region, and what signs pet owners should watch for. Our goal is simply to keep you
informed—not alarmed.
What Is Blastomycosis?
Blastomycosis is a fungal infection caused by organisms that live in soil and decaying
organic material. Dogs become infected by inhaling microscopic fungal spores from the
environment, often while doing very normal “dog things” like:
- Sniffing in wooded areas
- Playing near lakes or rivers
- Digging in soil
- Hiking or exploring outdoors
It’s important to know that blastomycosis is not contagious—it cannot spread from
pet to pet or from pets to people.
Why Are We Hearing More About It in Northern Illinois?
Blastomycosis has always been present in parts of the Midwest, including Illinois.
However, it may feel like we’re seeing more cases recently for a few reasons:
- Wetter conditions that help fungi thrive in soil
- Ongoing construction and soil disturbance in growing communities
- More time pets are spending outdoors with their families
- Increased awareness and improved veterinary testing
Areas like McHenry and surrounding counties—especially those near water, woods, or
active development—naturally have environments where exposure can occur.
Signs of Blastomycosis in Dogs
One of the challenges with blastomycosis is that it can look like many other illnesses at
first. Signs may include:
- Slower energy or seeming “not quite themselves”
- Fever
- Weight loss or reduced appetite
- Eye redness, cloudiness, or discharge or blindness
- Skin bumps or sores that don’t heal
- Limping or signs of pain
- Coughing that doesn’t go away
Because symptoms can vary, dogs may be evaluated for several conditions before
blastomycosis is identified.
What About Cats?
Cats can get blastomycosis, but it is much less common than in dogs. When it does occur, signs may include:
- Decreased appetite or weight loss
- Lethargy
- Skin lesions or wounds
- Eye inflammation
- Occasional breathing changes
Cats often hide illness well, so even subtle changes are worth checking out if they
persist.
Can People Get Blastomycosis?
Yes, people can also develop blastomycosis, but it is still uncommon.
It is important to know:
- It is not spread from pets to people
- Infection comes from the same environmental exposure source
In humans, symptoms often resemble pneumonia and may include cough, fever,
fatigue, or shortness of breath.
Treatment and Outlook
When diagnosed, blastomycosis is typically treated with long-term antifungal
medication. Treatment can take several months, but many dogs respond very
well—especially when the disease is caught early.
Early recognition really does make a difference in recovery.
When to Give Us a Call
We always encourage pet owners to reach out if something feels “off.” For
blastomycosis, we recommend scheduling an exam if you notice:
- A cough lasting more than a few days
- Unexplained tiredness or weight loss
- Eye changes
- Skin sores that are not healing
- Limping or discomfort without a clear injury
Even if it turns out to be something minor, it’s always better to check early.
A Final Thought for Our Community
Living in Northern Illinois means enjoying beautiful outdoor spaces—lakes, trails, parks,
and wooded areas. Most pets who enjoy these areas will never develop blastomycosis.
Our goal in sharing this information is simply awareness. When pet owners know what
to look for, we’re able to diagnose and treat conditions earlier—and that leads to better
outcomes.
As always, we’re here if you ever have questions or concerns about your pet’s health.