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Ask the Vet

Lepto Vaccine for Dogs: What to Know & Side Effects (Vet Answer)

Dr. Stacie Grannum DVM (Veterinarian)
By Dr. Stacie Grannum DVM (Veterinarian) · Written by Dr. Marta Vidal-AbarcaVet Approved
Dr. Marta Vidal-Abarca
Reviewed & Fact-Checked byDr. Marta Vidal-AbarcaBVSc GPCert Ophthal MRCVS (Veterinarian)
Dr. Marta has over 16 years of veterinary experience, working across the UK and Spain as a remote veterinary consultant and in the clinic. She graduated from Cardenal Herrera-CEU University in Valencia, Spain. She holds two Ophthalmology Certificates, GPCert Ophthal from ESVPS and UAB. She has wide experience in small animal internal medicine and surgery with a soft spot for dogs. Marta is a member of the Royal College of Veterinary Surgeons, and her main fields of interest are ophthalmology and critical care medicine. Dr. Marta loves being able to share the most helpful information with pet parents across the world as one of Pangolia's in-house veterinarians. She wants to provide details that can help in all aspects of pets' lives with their beloved ones. She loves knowing that she can support our readers and communicate about any medical topic that might be relevant to their pet's health and well-being.View authorThe information is current and up-to-date in accordance with the latest veterinarian research. Learn more
Updated on June 17, 2026
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black dachshund getting a vaccine

Vaccinations generally provide good protection for your dog against certain diseases that could be severe and debilitating. While no vaccine leads to 100% immunity, it lessens the severity of the signs and improves recovery time should the disease be contracted. Some diseases are zoonotic, meaning they can be transmitted from animals to people. These include the rabies virus and leptospirosis. Vaccinations designed for animals that prevent transmissible diseases to people are essential in reducing public health threats. Keeping both pets and people healthy is a priority.

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What Is the Leptospirosis Vaccine?

Leptospirosis is a disease caused by the bacterium Leptospira, found in both water and soil. The bacteria is more common in warm climates with high yearly rainfall averages, but it can proliferate anywhere after heavy rain and flooding. In the United States, infection rates in dogs seem to be higher in the southwestern, midwestern, and eastern regions.

All dogs are at risk of infection from leptospirosis, especially those that may come in contact with contaminated urine via:

  • Drinking from slow-moving or stagnant water sources, such as ponds, lakes, and streams
  • Exploring rural properties with exposure to infected farm animals and wildlife
  • Contact from potentially other infected dogs, such as at dog parks and boarding and training facilities
  • Contact with rodents

Leptospirosis can lead to kidney and liver failure and sometimes, severe lung disease, which causes difficulty breathing. This disease, even if treated, can be fatal.

Fortunately, a leptospirosis vaccine is available to help protect your dog and loved ones from this potentially life-threatening disease. It is recommended that all dogs be vaccinated to help protect them from infection.

Image by: ARVD73, Shutterstock

How Is the Leptospirosis Vaccine Given?

This vaccination is given under the skin (subcutaneously) and may be administered alone as its own separate vaccine or in combination with the distemper/parvo vaccine (DA2LPPv). Dogs 12 weeks of age and older can start the vaccination series. The initial series involves a set of two vaccinations, spaced 2–4 weeks apart, and then boosted annually.

What Happens If You Miss a Vaccination Dose?

If a dose is missed in an initial vaccination series, the series can be restarted with one vaccination given, followed by another given 2–4 weeks later to stimulate an appropriate immune response. The vaccination is recommended to be given annually after the initial series is completed, and if the annual booster is missed, it is recommended to booster as soon as possible.

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Potential Side Effects of the Leptospirosis Vaccine

The leptospirosis vaccine has been shown to have a similar frequency of side effects or adverse reactions as other vaccinations commonly given to dogs. The results from a large study involving over 1 million dogs showed that the rate of adverse reactions to the lepto vaccine was 0.3%. The benefits of vaccination far outweigh the risks, as leptospirosis is a life-threatening disease that can affect any dog worldwide. If you’re concerned about potential side effects, it’s best to discuss them with a vet. As with any vaccine, common temporary side effects may include:

  • Pain and tenderness at the injection site
  • Lethargy
  • Mild fever
  • Decreased appetite

More serious and potentially life-threatening side effects can include an anaphylactic reaction, which may produce signs like:

  • Vomiting or diarrhea
  • Hives
  • Facial swelling
  • Difficulty breathing
  • Collapse

It is advised to seek immediate veterinary care if you notice any of these signs.

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Frequently Asked Questions (FAQ)

At What Age Can My Dog Get the Leptospirosis Vaccine?

Dogs 12 weeks and older can start the initial vaccination series.

How Often Is the Leptospirosis Vaccine Boosted?

The current recommendation is to boost annually.

Is the Leptospirosis Vaccine More Dangerous Than Other Vaccines?

No, the leptospirosis vaccine has not been shown to have an increase in side effects after administration. Although this is considered a non-core vaccine, all dogs should be vaccinated for leptospirosis because it can be a potentially life-threatening disease and may be transmissible to people.

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Conclusion

While the leptospirosis vaccine is considered a non-core vaccine for canines, it is recommended that all dogs should receive it. Leptospira bacteria can be found in contaminated soil and water sources, especially in infected urine. Dogs with leptospirosis may experience kidney and liver failure and may develop breathing difficulties, which can be fatal. This disease is also zoonotic, meaning it can be transmitted to people, so a vaccinated dog also protects the entire household.

Also see:

Sources

Featured Image Credit: Masarik, Shutterstock

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Dr. Stacie Grannum DVM (Veterinarian)
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Dr. Stacie Grannum DVM (Veterinarian)

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