TL;DR: Should Brisbane Dog Owners Be Worried?

The short answer: Be aware, not alarmed—but take action.

Leptospirosis is a serious, potentially fatal bacterial disease affecting dogs across Australia, with confirmed cases rising in Queensland—particularly in flood-prone regions like North Queensland. While Brisbane itself has limited reported cases, the disease is present in surrounding areas, and environmental conditions (heavy rainfall, flooding, wildlife contact) create risk.

Quick Facts:

• What it is: Bacterial infection spread through contaminated water and wildlife urine
• High-risk areas in Australia: North Queensland (Ingham, Innisfail, Townsville, Cairns), coastal NSW, flood-affected regions
• Brisbane-specific risk: Low to moderate; cases detected in surrounding QLD regions, especially after flooding
• Vaccination: Nobivac Lepto 2 now available in Australia—84% effective against clinical disease, 88% effective against renal carrier status
• Survival rate: 80-90% with prompt treatment; drops to 40-50% with severe lung involvement
• It’s zoonotic: Humans can catch it from infected dogs
• Prevention is key: Annual vaccination, avoid standing water, control rodent populations

Action Steps:

✅ Vaccinate your dog annually (especially if you live near water, travel to high-risk areas, or have outdoor access)
✅ Avoid standing water after heavy rain or flooding
✅ Contact Dr. Stuart if you’re unsure about your dog’s vaccination status or if you plan to travel to high-risk regions
✅ Watch for symptoms: Lethargy, vomiting, loss of appetite, jaundice—seek vet care immediately

Book a consultation with Personalised Mobile Vet

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What Is Leptospirosis?

Leptospirosis is a bacterial infection caused by spiral-shaped bacteria called Leptospira. There are over 250 varieties (serovars), with at least 10 that commonly affect dogs. The bacteria thrive in warm, wet environments—particularly in stagnant or slow-moving water like puddles, ponds, rivers, and contaminated soil.

How Dogs Get Infected:

• Direct contact with urine from infected animals (rodents, rats, raccoons, cattle, pigs, other dogs)
• Drinking, swimming, or wading in contaminated water
• Contact with urine-soaked soil or bedding
• Bite wounds or through broken skin/mucous membranes (eyes, nose, mouth)
• Eating infected tissue
• Exposure during birth

The bacteria can survive for weeks to months in favourable conditions (warm, moist environments), making post-flood periods especially dangerous.

Incubation period: Approximately 7 days (range: 2–30 days)

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Leptospirosis in Australia: Where Are the Cases?

Queensland Data (2019-2023):

Queensland Health reports an average of 99 human cases annually, with notification rates fourfold greater in males and twofold greater in Aboriginal and Torres Strait Islander Queenslanders. Approximately half of all notified cases occur in Cairns and Hinterland Hospital and Health Service (Queensland Health, 2023).

High-Risk Localities in Australia:

North Queensland (Highest Risk):

• Ingham, Innisfail, Tully, Townsville, Cairns – Spike in canine cases following February 2025 floods; at least six dogs died in the region in recent days (Waller, 2025)
• Tropical climate, high rainfall, and flooding create ideal conditions for bacterial survival

Coastal NSW:

• Sydney: 36+ confirmed canine cases since 2017
• Newcastle & Shoalhaven: Additional outbreaks observed
• Victoria: 35 cases between Jan 2017–Dec 2023; 10 cases in 2024 alone; 37% fatality rate (Pet News Australia, 2024)

Central Queensland:

• Cases reported following major floods; direct contact with floodwater during the 2–30 day incubation period

Brisbane-Specific Risk:

While Brisbane itself has limited published data on canine leptospirosis cases, the disease is endemic in Queensland, and Brisbane’s proximity to high-risk regions, combined with:

• Heavy rainfall and flooding events
• Urban wildlife (rodents, possums) interactions
• Dog parks and shared outdoor spaces
• Proximity to rivers and waterways (Brisbane River, creeks)

…means Brisbane dog owners should remain vigilant, especially during and after wet weather.

If you’re unsure whether your dog is at risk or need advice on vaccination—especially if you plan to travel to North Queensland, coastal NSW, or flood-affected regions—contact Dr. Stuart at Personalised Mobile Vet.

Contact Dr. Stuart for personalised advice

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Risk Factors: Is Your Dog at Risk?

Environmental & Seasonal Risk Factors:

High-risk periods:

• Late summer and autumn (warmer, wetter months)
• After heavy rainfall and flooding – bacteria spread rapidly through contaminated water
• Spring and warmer winters – bacteria sensitive to extreme heat, cold, and UV light

High-risk environments:

• Flooded areas, standing water, muddy puddles
• Areas with rodent/wildlife activity (rats, possums, raccoons)
• Boarding facilities and kennels (urine-contaminated play yards, drainage pathways)
• Rural properties with livestock
• Dog parks and shared outdoor spaces
• Rivers, creeks, lakes, and slow-moving water sources

Dog-Specific Risk Factors:

Contrary to older beliefs, any dog can get leptospirosis, regardless of:

• Age (though younger dogs <1 year tend to get more severe forms)
• Breed (small and large breeds equally at risk)
• Sex (both males and females susceptible)
• Lifestyle (urban, suburban, and rural dogs all at risk)

Higher-risk dogs:

• Intact males and working dogs (some studies)
• Dogs with outdoor access to wildlife/rodent habitats
• Dogs in flood-affected areas
• Unvaccinated dogs
• Dogs that swim or play in natural water sources

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Symptoms: What to Watch For

Early Signs (Often Vague):

Leptospirosis symptoms can be non-specific and easily mistaken for other illnesses:

• Lethargy, depression
• Loss of appetite (anorexia)
• Fever or low body temperature
• Vomiting
• Diarrhoea
• Muscle pain, stiffness, weakness, trembling
• Reluctance to move
• Eye and nasal discharge
• Increased or decreased urination

Progressive/Severe Signs:

As the disease advances (often within days), more serious symptoms appear:

• Kidney failure: Back pain, dehydration, decreased/absent urine production (oliguria/anuria), azotemia
• Liver disease: Jaundice (yellowing of gums, skin, whites of eyes), elevated liver enzymes
• Bleeding disorders: Nosebleeds, bruising, blood in stool/vomit/urine, petechiae (pinpoint red spots on gums)
• Respiratory distress: Coughing, difficulty breathing, pulmonary haemorrhage (life-threatening)
• Eye inflammation: Uveitis (cloudy or colour-changed eyes)
• Severe cases: Multi-organ failure, death

Critical: If your dog shows any combination of these signs—especially after potential exposure to contaminated water—seek veterinary care immediately.

Book an urgent consultation with Dr. Stuart

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Diagnosis: How Vets Detect Leptospirosis

Diagnosing leptospirosis requires a combination of tests:

Blood & Urine Tests:

• Azotemia (elevated kidney values) in 80-90% of cases
• Elevated liver enzymes, bilirubin
• Electrolyte abnormalities (hyponatremia, hypokalemia, hyperphosphatemia)
• Anaemia, neutrophilia, thrombocytopenia
• Urinalysis: isothenuria, glucosuria, proteinuria, bilirubinuria

Leptospira-Specific Tests:

1. PCR Testing (Polymerase Chain Reaction):

• Detects bacterial DNA in blood (first 10 days) or urine (after first week)
• Pros: Fast results, not affected by vaccination
• Cons: Negative result doesn’t rule out disease (intermittent shedding)

2. MAT (Microscopic Agglutination Test):

• Measures antibody levels against different serovars
• Requires paired samples (acute and convalescent, 7-14 days apart) for best accuracy
• Titer ≥1:800 considered positive (≥1:3200 if vaccinated)
• Pros: Gold standard
• Cons: Takes time, vaccination can cause positive results

3. Point-of-Care Tests (e.g., SNAP® Lepto, WITNESS® Lepto):

• Rapid in-clinic results (20 minutes)
• Pros: Quick screening
• Cons: Doesn’t distinguish vaccination from infection; needs confirmation with MAT/PCR

Imaging:

• Chest X-rays: May show pulmonary haemorrhage (alveolar/nodular pattern)
• Abdominal ultrasound: Renomegaly, increased kidney echogenicity, liver changes

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Treatment: What Happens If Your Dog Gets Leptospirosis?

Antibiotics:

Doxycycline is the primary treatment:

• Dosage: 5 mg/kg, orally, every 12 hours for 2 weeks minimum
• Clears bacteria from bloodstream within 24 hours
• Takes ~1 week to clear from urine
• Alternative: Penicillin derivatives (IV initially if vomiting), followed by doxycycline

Other household dogs: Treat all dogs in the household prophylactically with doxycycline for 2 weeks.

Supportive Care:

Fluid therapy:

• IV fluids to support kidney function
• Critical: Monitor hydration closely—polyuric dogs need high fluid rates; oliguric/anuric dogs risk overhydration

Kidney support:

• Electrolyte correction (potassium, sodium, phosphorus)
• Acid-base balance management
• Dialysis/hemodialysis for severe cases (oliguria/anuria, progressive azotemia, hyperkalemia)

Liver support:

• Manage hepatic encephalopathy, hypoglycemia
• Anti-emetics, appetite stimulants

Respiratory support:

• Oxygen therapy, mechanical ventilation for pulmonary haemorrhage

Other medications:

• Anti-hypertensives, pain control, nutritional support

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Prognosis: What Are the Survival Rates?

With aggressive treatment:

• 80-90% survival rate for most cases
• >80% survival if dialysis is available for severe kidney injury

Poor prognosis indicators:

• Severe pulmonary haemorrhage (40-50% survival)
• Anuria/oliguria without dialysis (grave prognosis)
• Respiratory distress requiring ventilation

Long-term outcomes:

• Some dogs develop chronic kidney disease and require lifelong monitoring
• Most dogs that survive acute phase recover fully with appropriate care

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Vaccination: The Most Effective Prevention

Nobivac Lepto 2: Now Available in Australia

What it protects against:

• Two serogroups: Australis and Icterohaemorrhagiae
• Four serovars: Canicola, Icterohaemorrhagiae, Grippotyphosa, Pomona

Vaccination schedule:

• Initial series: 2 doses, 3-4 weeks apart
• Starting age: Can vaccinate puppies as young as 6 weeks old
• Boosters: Annually

Availability:

• Released in late 2024 to fill the gap from previous vaccine shortages (Treidlia Auslepto recall in 2023)
• Available in 50-dose packs from veterinary wholesalers nationwide

Vaccine Efficacy: What the Science Says

A comprehensive systematic review and meta-analysis of commercially available leptospirosis vaccines (Bergmann Esteves et al., 2022) analysed data from multiple studies and found:

Overall protection:

• 84% effective against clinical disease (Relative Risk = 0.16)
• 88% effective against renal carrier status, preventing urine shedding (Relative Risk = 0.12)

Key findings:

• Vaccinated dogs had a significantly reduced risk of developing clinical leptospirosis compared to unvaccinated controls
• Immunity persists for at least one year under experimental conditions
• Protection against serovars Canicola, Australis, and Grippotyphosa is consistent for most vaccine brands
• Vaccination reduces renal colonisation and urine shedding, lowering zoonotic risk to humans

Important notes:

• Vaccines don’t protect against all 250+ serovars, but cover the most common disease-causing strains
• Vaccinated dogs can still get infected with non-vaccine serovars (but disease is typically milder and less severe)
• Annual boosters are essential to maintain protection

Vaccine Side Effects: What to Expect

Common (mild) side effects:

• Soreness at injection site
• Mild lethargy or sleepiness
• Temporary loss of appetite
• Low-grade fever

Rare side effects:

• Vomiting or diarrhoea
• Hives or facial swelling (allergic reaction)
• Anaphylaxis (extremely rare)

Critical context:

• The overall incidence of suspected adverse reactions for leptospirosis vaccines is considered RARE
• Adverse reactions are no more common than other routine vaccines
• The 2023 Treidlia Auslepto recall was due to adverse reactions (one dog died, seven had reactions); Nobivac Lepto 2 has a strong safety profile

Most dogs tolerate the vaccine well, and the benefits of protection far outweigh the minimal risk of side effects.

If you have concerns about vaccine safety or your dog’s specific health conditions, contact Dr. Stuart for personalised advice.

Learn more about our vaccination services(Internal link: Link to vaccination/wellness services page)

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Who Should Be Vaccinated?

Leptospirosis vaccination is now considered a core vaccine in endemic areas (per WSAVA and ACVIM guidelines).

All dogs should be vaccinated, especially:

• Dogs living in or travelling to high-risk areas (North Queensland, flood-prone regions, coastal areas)
• Dogs with outdoor access to water sources, wildlife, or rodent habitats
• Dogs that frequent dog parks, boarding facilities, or rural properties
• Working dogs and hunting dogs
• Any dog whose lifestyle includes potential exposure to contaminated water or wildlife

If you plan to travel to high-risk regions with your dog—particularly North Queensland, coastal NSW, or flood-affected areas—consider vaccination before you go. Contact Dr. Stuart to discuss your dog’s individual risk and vaccination timeline.

Book a pre-travel consultation(Internal link: Link to booking/contact page)

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Other Prevention Measures

While vaccination is the most effective prevention, reducing environmental exposure is also important:

Reduce exposure:

• Avoid stagnant/standing water (puddles, ponds, floodwaters)
• Keep dogs on shorter leads near water sources
• Prevent access to areas with wildlife/rodent activity
• Control rodent populations around your property
• Clean up urine-contaminated areas with iodine-based disinfectants

Post-exposure prophylaxis:

• If your dog was recently exposed to potentially contaminated water, oral doxycycline for 14 days can prevent infection
• Contact Dr. Stuart immediately if you suspect exposure

Read more about our preventive care approach(Internal link: Link to services or wellness page)

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Zoonotic Risk: Protecting Yourself

Leptospirosis can spread from dogs to humans through contact with infected urine or blood.

Precautions for Dog Owners

If your dog has leptospirosis:

• Wear gloves when cleaning up urine
• Wash hands thoroughly after handling your dog
• Isolate your dog from other animals until antibiotic treatment is complete (at least 2 weeks)
• Allow urination only in designated areas that can be cleaned and disinfected
• Avoid contact with urine/blood on skin or mucous membranes
• Risk decreases significantly after 72 hours of antibiotics

General precautions:

• Avoid flooded/standing water that wildlife can access
• Wear protective equipment if working in high-risk professions (farming, abattoir work, veterinary medicine)
• Cover wounds with waterproof dressings
• Wash hands regularly

If you develop symptoms (fever, muscle pain, headache, jaundice), contact your physician immediately and mention your dog’s diagnosis.

Final Word: Protection Starts with Knowledge (and a Simple Jab)

Leptospirosis might not be on every Brisbane dog owner’s radar yet, but it should be. The disease is serious, it’s spreading, and it’s preventable. The good news? You’re already ahead by reading this far.

Here’s what matters:

If your dog spends time outdoors—whether that’s splashing through puddles at the dog park, exploring bushland, or simply having a backyard sniff around after rain—they’re exposed to the same environment that harbours leptospirosis. Add in Queensland’s unpredictable weather, our love of water, and an urban wildlife population that’s thriving, and the risk becomes real.

But real risk doesn’t mean panic. It means being informed, proactive, and prepared.

Vaccination works. It’s not perfect, but it’s the single most effective tool we have to protect dogs from the most dangerous strains of leptospirosis. Combined with simple environmental awareness—avoiding stagnant water, keeping your property rodent-free, and staying alert after floods—you’re giving your dog the best chance at staying healthy.

If you’re unsure where to start, that’s what I’m here for. Whether it’s checking your dog’s vaccination history, discussing their individual risk factors, or simply answering your questions without the rush—contact Dr. Stuart at Personalised Mobile Vet. We’ll come to you, take the time your dog needs, and make sure they’re protected.

Because at the end of the day, your dog trusts you to keep them safe. And sometimes, that’s as simple as a conversation and a vaccine.

References

• Australian Veterinary Association 2024, Leptospirosis update for the year 2024, University Veterinary Teaching Hospital Sydney, viewed 21 October 2025, https://www.ava.com.au/siteassets/advocacy/vaccination-of-dogs-and-cats/leptospirosis-update-for-the-year-2024-uvths.pdf.
• Bergmann Esteves, F, Lau, CL, Weinstein, P & Soares Magalhães, RJ 2022, ‘A systematic review and meta-analysis of the efficacy of leptospirosis vaccines in dogs’, Preventive Veterinary Medicine, vol. 199, 105567, https://doi.org/10.1016/j.prevetmed.2022.105567.
• Cornell University College of Veterinary Medicine n.d., Canine leptospirosis, Riney Canine Health Center, viewed 21 October 2025, https://www.vet.cornell.edu/departments-centers-and-institutes/riney-canine-health-center/canine-health-information/canine-leptospirosis.
• Kelman, M, Ward, MP & Barrs, VR 2017, ‘Canine leptospirosis in Australia: An update on diagnosis, epidemiology and prevention’, Australian Veterinary Journal, vol. 95, no. 7, pp. 261–268, https://doi.org/10.1111/avj.12597.
• Merck Veterinary Manual n.d.a, Leptospirosis in dogs, viewed 21 October 2025, https://www.msdvetmanual.com/infectious-diseases/leptospirosis/leptospirosis-in-dogs.
• Merck Veterinary Manual n.d.b, Leptospirosis in dogs (Dog owners), viewed 21 October 2025, https://www.msdvetmanual.com/dog-owners/disorders-affecting-multiple-body-systems-of-dogs/leptospirosis-in-dogs.
• New South Wales Department of Primary Industries n.d., Leptospirosis, Laboratory Services, viewed 21 October 2025, https://www.dpi.nsw.gov.au/about-us/services/laboratory-services/veterinary/leptospirosis.
• New South Wales Health n.d., Leptospirosis fact sheet, viewed 21 October 2025, https://www.health.nsw.gov.au/Infectious/factsheets/Pages/leptospirosis.aspx.
• Pet News Australia 2024, New vaccine tackles growing threat of canine leptospirosis, viewed 21 October 2025, https://petnews.com.au/new-vaccine-tackles-growing-threat-of-canine-leptospirosis/.
• Queensland Health 2023, Leptospirosis in Queensland: 2019 to 2023, Communicable Diseases Branch, viewed 21 October 2025, https://www.health.qld.gov.au/__data/assets/pdf_file/0025/1265847/lepto-qld-2019-2023.pdf.
• SASH Vets n.d., Leptospirosis in dogs, viewed 21 October 2025, https://sashvets.com/diseases/leptospirosis-in-dogs/.
• Sykes, JE, Hartmann, K, Lunn, KF, Moore, GE, Stoddard, RA & Goldstein, RE 2011, ‘2010 ACVIM small animal consensus statement on leptospirosis: Diagnosis, epidemiology, treatment, and prevention’, Journal of Veterinary Internal Medicine, vol. 25, no. 1, pp. 1–13, https://doi.org/10.1111/j.1939-1676.2010.0654.x.
• The American Veterinary Medical Association n.d., Leptospirosis, Pet Care, viewed 21 October 2025, https://www.avma.org/resources-tools/pet-owners/petcare/leptospirosis.
• Today’s Veterinary Practice n.d., Diagnosis and treatment of leptospirosis in dogs, viewed 21 October 2025, https://todaysveterinarypractice.com/infectious-disease/diagnosis-and-treatment-of-leptospirosis-in-dogs/.
• Veterinary Partner n.d., Leptospirosis, VIN, viewed 21 October 2025, https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951453.
• Waller, K 2025, ‘Leptospirosis spike: Dog deaths in flooded north Queensland’, ABC News, 19 February, viewed 21 October 2025, https://www.abc.net.au/news/2025-02-19/leptospirosis-spike-dog-deaths-flooded-north-queensland/104955410.