"Doc, after Jakarta flooded yesterday my dog got into the dirty water and now he has a high fever and is weak and won't eat. Is it dangerous?" This question comes up almost every rainy season — a dog exposed to floodwater, then sick acutely a few days later. One of the possible causes that must be seriously considered is leptospirosis.
Leptospirosis is not an ordinary canine disease. Besides being potentially fatal for dogs (acute kidney failure, pulmonary hemorrhage), this disease is also a zoonosis — it can spread to humans. In Indonesia's tropical climate with high rainfall + dense rat populations in urban areas, lepto is one of the most relevant infectious disease threats for dogs living in Jabodetabek. This article explains what Leptospira is, why the zoonosis is dangerous, the clinical signs, the available vaccine, and practical prevention at home.
What is Leptospira and why is it different from other bacteria?
Leptospira is a spiral-shaped bacterium (spirochete) belonging to a unique genus — not the "ordinary" bacteria often studied in school. Its spiral shape lets it "drill" in through scratched skin, the mucous membranes of the eyes, the mouth, or the nose.
The genus Leptospira has many serovars (variants) — more than 250 pathogenic serovars are known. Those relevant to dogs are generally a few main serovars, and a vaccine's composition usually covers the serovars most commonly found locally.
Serovars common in tropical climates, including Indonesia:
- Canicola — traditionally associated with dogs as a reservoir
- Icterohaemorrhagiae — associated with rats (the main reservoir in tropical urban areas)
- Grippotyphosa — associated with wildlife (civets, squirrels)
- Pomona — associated with livestock (cattle, pigs)
- Bratislava — associated with pigs, horses (more common abroad)
In Indonesia, several local serosurvey studies show Icterohaemorrhagiae is most frequently detected in clinical canine cases — which makes sense given the high rat population in large cities and informal settlements. The exact pattern can vary by region, and not every seropositive dog is clinically sick.
Zoonosis — why lepto is serious for dog owners
Leptospirosis is a zoonosis — it can spread from animals to humans, and vice versa. The most common route of transmission: contact of the skin/eyes/mouth with the urine of an infected animal (a sick dog, rats, livestock) or with water/soil contaminated with urine.
Why the zoonosis risk is high in Indonesia, especially after flooding:
- Leptospira bacteria can survive for weeks in fresh water that isn't too acidic (rivers, puddles, ponds) and in moist soil
- Floods spread rat urine (the main urban reservoir in Indonesia) across a wide area
- People contact dirty water when cleaning their homes after flooding — risk of entry through a cut on the foot, or water getting into the eyes/mouth
- Dogs that play in puddles, drink from puddles, or come home with dirty paws and then lick them — all are high-exposure routes
Lepto symptoms in humans often resemble dengue fever or the early phase of severe flu: sudden high fever, headache, characteristic calf-muscle pain, red eyes, nausea. Severe cases can progress to kidney failure (Weil's disease) or pulmonary hemorrhage. If you or a family member has symptoms like these after flooding or after contact with a sick dog, consult a general practitioner immediately and mention the exposure history.
In the context of Jakarta and other large Indonesian cities with high rainfall + annual flooding, leptospirosis is monitored by the Ministry of Health as a zoonotic disease that appears seasonally after floods. Vaccinating pet dogs is one of the family's preventive measures.
Transmission — how dogs get infected
Leptospira bacteria spread through the urine of infected animals. Dogs can be exposed through:
- Drinking water from puddles, ponds, rivers, or gutters contaminated with the urine of rats or other sick dogs
- Swimming or playing in floodwater — the bacteria can enter through abraded skin, the eyes, the nose, the mouth
- Direct contact with rats — dogs that often catch rats are at risk
- Contact with the urine of other sick dogs at a dog park, garden, or while out walking
- Contaminated moist soil — a cut paw stepping on contaminated soil, then licking the paw
Incubation period: usually 5-14 days after exposure, sometimes longer. A dog that recovers from lepto can keep shedding bacteria in its urine for months, becoming a source of transmission to other dogs and to the family.
Clinical signs of canine leptospirosis — why it's often misdiagnosed
Leptospirosis is often called "the great pretender" because its early symptoms resemble many other diseases. The clinical presentation can range from very mild (subclinical) to acutely fatal.
Common early signs (acute phase):
- Sudden acute fever — rectal temperature can be above 40°C
- Severe lethargy — the dog suddenly won't move and sleeps constantly
- Complete anorexia — appetite vanishes entirely within hours
- Vomiting — often, sometimes with diarrhea
- Muscle pain — the dog looks stiff, refuses to walk, with a hunched posture
- Rapid dehydration — dry gums, sunken eyes
- Excessive drinking + excessive urination (or the opposite, little to no urination if the kidneys have already failed)
More specific signs (later phase, more serious prognosis):
- Jaundice (icterus) — yellowing of the whites of the eyes, gums, belly skin — a sign of liver damage
- Acute kidney failure — very little or no urination, persistent vomiting, urea-smelling breath
- Pulmonary hemorrhage syndrome (LPHS) — bleeding into the lungs, fast and labored breathing, coughing up blood, sometimes appearing suddenly with high mortality
- Bleeding — petechiae (tiny red spots) on the gums/skin, nosebleeds, blood in the stool
- Red eyes / uveitis
What requires an immediate trip to the vet (without waiting for confirmation): sudden high fever + severe weakness + persistent vomiting + a history of exposure to floodwater or puddles. If lepto is diagnosed quickly and treated aggressively (IV fluids + antibiotics), the prognosis is far better than once it has entered the kidney-failure or pulmonary-hemorrhage phase.
Diagnosis usually uses a combination of clinical signs + blood tests (MAT — microscopic agglutination test, or PCR of urine/blood). Prior vaccination can interfere with MAT interpretation, so the vet usually requests paired titers (acute + convalescent 2-4 weeks later) for confirmation.
The lepto vaccine — per WSAVA 2024 = core for dogs in Indonesia
An important point that is often misunderstood: per the WSAVA 2024 guidelines, the leptospirosis vaccine is a CORE vaccine for dogs in Leptospira-endemic areas — including tropical Indonesia. This differs from older guidelines that classified lepto as a "universal" non-core vaccine.
Reasons it was elevated to core in endemic areas:
- A tropical climate + high rainfall = ideal environmental conditions for Leptospira to survive
- A dense rat population in urban areas = a widely available reservoir
- The zoonosis risk to owners is not theoretical — human cases appear seasonally
- Mortality in lepto-positive dogs is significant if not treated quickly
The 4-serovar vaccine — what's available
The modern lepto vaccine in Indonesia is generally 4-serovar (quadrivalent):
- Canicola
- Icterohaemorrhagiae
- Grippotyphosa
- Pomona
Some older products are still 2-serovar (Canicola + Icterohaemorrhagiae) — narrower coverage. For maximum protection in Indonesia, many vets choose a 4-serovar product such as Nobivac L4 (Intervet/MSD) — discuss with your veterinarian about the products available at your local clinic.
Lepto vaccine schedule
- Initial series: 2 doses 2-4 weeks apart. Start at 8-12 weeks of age (check the specific product guidelines)
- Annual booster — every 12 months. Unlike the DHPP vaccine, which many now recommend every 3 years, the lepto vaccine remains annual because immunity is short-lived
- It can be given together with the DHPP booster in a single visit
Lepto vaccine side effects — what to know
The lepto vaccine has traditionally been known to have a slightly higher rate of side effects than other core vaccines (DHPP). Most are still mild and resolve on their own:
- Mild lethargy for 24-48 hours after the vaccine (common, normal)
- Reduced appetite for a day (common)
- Mild fever
- Swelling at the injection site
- A moderate allergic reaction (facial/eye swelling, itching) — rare but possible within 1-24 hours after the vaccine
- Anaphylaxis (a severe allergic reaction) — very rare but a medical emergency, usually appearing within minutes of the vaccine
For small toy-breed dogs (body weight under 5 kg) or dogs with a history of previous vaccine reactions, the vet may pre-medicate with an antihistamine or use split dosing — discuss this if you are concerned. An allergic reaction after the lepto vaccine is NOT a permanent reason to skip the vaccine — dogs in endemic areas still need protection, they just need specific risk management.
Managing lepto-positive dogs — doxycycline + supportive care
A dog suspected or confirmed to have lepto is a medical emergency that needs aggressive care. This is usually not a case that can be managed at home — it needs hospitalization at a clinic with IV fluid + monitoring facilities.
Main treatment components (per the ACVIM Consensus on Lepto):
- Doxycycline — the antibiotic of choice. It covers the bacteremia phase (bacteria in the blood) while also clearing the shedding phase in the kidneys. The total duration is usually 2 weeks. For a very sick dog that can't take oral medication, start with IV antibiotics (ampicillin) until stable, then continue with oral doxycycline
- Aggressive IV fluid therapy — correct dehydration, support kidney function, flush toxins
- Anti-nausea — maropitant or ondansetron to control vomiting
- Kidney monitoring — check BUN, creatinine, SDMA, daily urine output
- Liver monitoring — if there is jaundice, check ALT/ALP/bilirubin
- Dialysis — for severe kidney failure cases that don't respond to IV fluids (limited facilities in Indonesia, high cost)
- Oxygen + bed rest — for pulmonary hemorrhage cases
Prognosis: highly variable depending on speed of diagnosis + severity at admission. Cases treated early (before kidney failure) have a good prognosis. Cases with oliguria/anuria or pulmonary hemorrhage syndrome have high mortality (can be 50%+).
For owners while the dog is being treated: use gloves + wash your hands with soap when handling the dog, especially when cleaning up urine/vomit. Avoid direct contact with the urine. Tell your family's general practitioner if anyone has lepto-like symptoms.
Prevention at home in Jakarta + flood-prone areas
The most effective combination of protection:
- Annual lepto vaccine — the main foundation (see the schedule above)
- Don't let your dog drink from puddles / ponds / gutters — bring your own bottle of drinking water when out walking
- Avoid flooded areas + puddles — postpone walks in recently flooded areas for at least a few days after the water recedes + the sun has had time to dry it out
- Control rats in and around the home — seal gaps, store food in airtight containers, call pest control if there's a heavy infestation
- Wash your dog's paws with clean water + soap after returning from a walk in the rainy season, before coming inside
- Don't let your dog catch / eat dead rats
- Wear gloves + rubber boots when you yourself are cleaning the house after a flood
- Booster vaccine before the rainy season — if the booster schedule falls in Sep-Oct before the peak of the rainy season, it's ideal for dogs in Jabodetabek
Canine leptospirosis FAQ
My dog rarely leaves the house — does he still need the lepto vaccine?
He still needs it. Rats can get into the yard and urinate in pots, the garden, or the garage. Jakarta floods can bring dirty water up to the home's porch. The risk is lower than for a dog that often walks in public parks, but it isn't zero. The WSAVA 2024 guidelines for endemic areas of Indonesia still recommend the lepto vaccine as core.
Small toy-breed dogs — can they get the lepto vaccine?
Yes. The lepto vaccine is not contraindicated for small dogs. It's true that toy breeds have a slightly higher rate of vaccine reactions in general, so the vet may pre-medicate or use split dosing. Discuss it with your veterinarian if your dog has a history of previous reactions.
I also have a cat — does the cat need the lepto vaccine?
No. Cats are relatively resistant to clinical leptospirosis — although they can be seropositive, they rarely get seriously ill and rarely shed bacteria into the environment. A lepto vaccine for cats is not available and is not routinely recommended.
How long does lepto vaccine protection last?
About 12 months for the serovars in the vaccine. This is why an annual booster is mandatory — unlike the DHPP core vaccine, which many now recommend extending to 3 years.
Does the lepto vaccine cover all Leptospira serovars?
No. The 4-serovar vaccine covers only the 4 serovars in the vaccine's composition. Cross-protection between serovars is limited. So the vaccine significantly reduces the risk + severity but does not 100% prevent every possible lepto infection. Environmental prevention is still needed (avoid floodwater, rat control, etc.).
Does a dog that has recovered from lepto need re-vaccination?
Yes — immunity after natural infection is specific to the infecting serovar and does not cover other serovars. A dog that has had lepto from serovar Icterohaemorrhagiae can still be infected by serovar Canicola or Grippotyphosa. The vaccine is continued annually per the normal protocol after the dog has fully recovered.
How much does the lepto vaccine cost in Jakarta?
The cost of the lepto vaccine isn't a single figure — it depends on the product type (2-serovar vs 4-serovar), the clinic, your dog's breed and size, and whether it's combined with a DHPP booster in a single visit (an annual package) or uses a house call service (which adds the vet's visit fee to your area). Because there are so many variables, the most accurate way is a direct consultation. Ask Prabasavet on WhatsApp for a free consultation and a specific estimate for your area.
Summary
Leptospirosis is a serious bacterial disease relevant to dogs in Indonesia because of the tropical climate + dense rat populations + seasonal flooding. Besides threatening a dog's life (acute kidney failure, pulmonary hemorrhage), this disease is a zoonosis — it can spread to owners and their families.
Per the WSAVA 2024 guidelines, the lepto vaccine is core for dogs in endemic areas of Indonesia — not optional. Schedule: 2 initial doses 2-4 weeks apart + an annual booster (it cannot be extended like DHPP). The 4-serovar vaccine (Canicola, Icterohaemorrhagiae, Grippotyphosa, Pomona) is available in Indonesia.
Typical acute clinical signs: sudden fever + severe weakness + vomiting + rapid dehydration, sometimes progressing to jaundice or kidney failure. A dog with a history of exposure to floodwater / puddles + acute symptoms must be taken to a clinic immediately — this is not a case for home care. Treatment: doxycycline for 2 weeks + aggressive IV fluids + supportive care.
Want to get your dog's lepto vaccine done at home without queuing at the clinic (which is often a source of stress + exposure to other infectious diseases)? See Prabasavet's at-home vaccination service or contact us on WhatsApp for a free consultation about your dog's complete vaccination schedule.
Read also: Complete Pet Vaccination Guide, Dog Vaccination Schedule: Puppy + Adult, Bordetella Kennel Cough in Dogs.
Medical references used in this article
This article was prepared with reference to the following sources, verified clinical sentence by sentence:
- Squires RA, et al. WSAVA Guidelines for the Vaccination of Dogs and Cats. Journal of Small Animal Practice 2024 — Leptospira section: elevated to core status for dogs in endemic areas (including tropical Indonesia), schedule of 2 initial doses + annual booster
- Sykes JE, Hartmann K, Lunn KF, et al. 2010 ACVIM Small Animal Consensus Statement on Leptospirosis: Diagnosis, Epidemiology, Treatment, and Prevention. Journal of Veterinary Internal Medicine — protocol of doxycycline for 2 weeks, aggressive IV fluids, management of pulmonary hemorrhage syndrome
- Plumb's Veterinary Drug Handbook, 7th edition — doxycycline monograph (dose, duration, side effects), ampicillin as an initial IV alternative
- CDC Zoonosis Reference — leptospirosis as a post-flood zoonosis, transmission route from animal urine to water/soil, human clinical symptoms (Weil's disease)
- Reagan KL, Sykes JE. Diagnosis of Canine Leptospirosis. Veterinary Clinics of North America: Small Animal Practice — MAT interpretation, the role of paired titers, urine PCR
This article is a general guide based on the international WSAVA 2024 guidelines + ACVIM Consensus + current clinical literature. For your dog's specific condition — including vaccination history, current health status, and level of environmental exposure risk — consulting a veterinarian is the right step. A dog with acute signs (sudden high fever + severe weakness + vomiting) plus a history of exposure to floodwater / puddles must be taken immediately to a clinic with IV fluid + laboratory monitoring facilities — this is not a case that is safe to manage at home.
