Quick Answer
The leptospirosis (lepto) vaccine is a non-core vaccine that many vets now recommend routinely due to increasing prevalence. It requires 2 initial doses given 2-4 weeks apart, plus annual boosters. Cost: $15-$30 per dose. Lepto can spread to humans, making vaccination important for at-risk dogs.
Table of Contents
What Is Leptospirosis?
Leptospirosis is a bacterial infection caused by spirochete bacteria of the genus Leptospira. The bacteria are spread through the urine of infected animals — including raccoons, rats, skunks, opossums, and livestock — and can survive for months in warm, moist environments.
Dogs become infected by drinking from or wading in contaminated water sources (puddles, ponds, streams), contact with contaminated soil, or direct contact with infected animal urine. The bacteria enter through mucous membranes or through cuts and abrasions in the skin.
Leptospirosis symptoms in dogs include:
- Fever: High temperature, often over 103°F
- Vomiting and diarrhea: Gastrointestinal distress is common in early infection
- Lethargy: Significant loss of energy and reluctance to move
- Increased thirst and urination: Signs of kidney involvement
- Jaundice: Yellowing of the eyes, gums, and skin (liver involvement)
- Kidney failure: In severe cases, leading to decreased or no urine production
- Bleeding disorders: Blood in vomit, stool, or from gums
Important
Without treatment, leptospirosis can be fatal. It causes severe kidney and liver damage that may become irreversible. Early diagnosis and antibiotic treatment are critical for survival.
Risk Factors: Does Your Dog Need the Lepto Vaccine?
Leptospirosis has been reported in all 50 states, though cases are more common in regions with warm, humid climates and heavy rainfall. Your dog's risk depends on their lifestyle and environment.
Higher Risk
- • Dogs that drink from puddles, streams, or ponds
- • Dogs in areas with wildlife (raccoons, rats, skunks)
- • Hunting, hiking, or farm dogs
- • Dogs in suburban and rural areas
- • Dogs in areas with frequent flooding or heavy rainfall
- • Dogs that roam off-leash in wooded or grassy areas
Lower Risk
- • Strictly indoor or apartment dogs
- • Dogs in arid, dry climates
- • Dogs that only walk on paved surfaces
- • Dogs with no wildlife exposure
Even dogs considered "low risk" can be exposed — urban rats and raccoons carry leptospirosis, and standing water in city parks or backyards can harbor the bacteria after rainfall. Many veterinarians now recommend the lepto vaccine for virtually all dogs.
Lepto Vaccine Schedule
Vaccination Timeline
First dose: 12 weeks or older
Can be given at the same time as DHPP and other puppy vaccines. Some vets prefer to administer it separately in small-breed puppies.
Second dose: 2-4 weeks after first dose
Both doses are required for initial immunity. The dog is not considered protected until 1-2 weeks after the second dose.
Annual booster: Every 12 months
The lepto vaccine provides immunity for approximately 12 months. There is no 3-year option — annual revaccination is always required.
The lepto vaccine is often combined with DHPP to create a DHLPP combination vaccine. Ask your vet whether they use a standalone lepto vaccine or a combination. For the full puppy timeline, see our puppy vaccination schedule guide.
How Much Does the Lepto Vaccine Cost?
| Scenario | Cost | Notes |
|---|---|---|
| Single dose (standalone) | $15-$30 | Exam fee ($45-$65) usually separate |
| Initial 2-dose series | $30-$60 | Two visits, 2-4 weeks apart |
| DHLPP combination vaccine | $25-$45 | Includes DHPP + lepto in one injection |
| Lepto treatment (if infected) | $500-$6,000+ | Hospitalization, IV fluids, antibiotics, dialysis in severe cases |
The annual lepto booster at $15-$30 is a small investment compared to the $500-$6,000+ cost of treating an active leptospirosis infection, which often requires hospitalization.
Side Effects of the Lepto Vaccine
The lepto vaccine has historically been associated with a slightly higher rate of vaccine reactions compared to other canine vaccines, particularly in small dogs under 10 pounds. However, modern 4-serovar lepto vaccines have a significantly improved safety profile.
Mild & Common (1-2 Days)
- • Soreness or swelling at injection site
- • Mild lethargy or sleepiness
- • Slight decrease in appetite
- • Low-grade fever
Rare — See Vet Immediately
- • Facial swelling or hives (more common in small breeds)
- • Persistent vomiting within hours of vaccination
- • Difficulty breathing
- • Collapse or extreme weakness
If your dog is a small breed (under 10 lbs), your vet may recommend giving the lepto vaccine separately from other vaccines to reduce the chance of a reaction. Pre-treatment with an antihistamine may also be discussed. For more details, see our vaccine side effects guide.
Is the Lepto Vaccine Core or Non-Core?
The AAHA (American Animal Hospital Association) currently classifies the leptospirosis vaccine as non-core, meaning it is recommended based on risk rather than required for all dogs. However, many veterinary practices now treat it as a de facto core vaccine and recommend it for nearly every dog.
The shift toward broader recommendation is driven by several factors:
- Leptospirosis cases have increased significantly in both urban and suburban areas
- Wildlife carriers (rats, raccoons) are abundant even in cities
- Leptospirosis can spread from dogs to humans (zoonotic disease)
- Climate change and increased rainfall have expanded the bacteria's range
- Modern lepto vaccines have fewer side effects than older formulations
Discuss your dog's specific risk factors with your veterinarian to decide whether the lepto vaccine is right for your pet. For a comprehensive look at all vaccines, visit our complete dog vaccine guide.
Can Leptospirosis Spread to Humans?
Yes. Leptospirosis is a zoonotic disease, meaning it can spread from animals to people. Humans can become infected through:
- Direct contact with an infected dog's urine
- Contact with contaminated water, soil, or surfaces
- Handling an infected dog without proper hygiene
In humans, leptospirosis causes flu-like symptoms that can progress to kidney damage, liver failure, and meningitis. Vaccinating your dog not only protects them but also reduces the risk of transmission to your family.
Household Safety
If your dog is diagnosed with leptospirosis, wear gloves when handling their urine, disinfect contaminated surfaces with a bleach solution, and wash your hands thoroughly. Children and immunocompromised individuals should avoid contact with the infected dog until treatment is complete.
Frequently Asked Questions
How much does the leptospirosis vaccine cost for dogs?+
Does my dog really need the lepto vaccine?+
What are the side effects of the lepto vaccine?+
How often do dogs need the lepto vaccine?+
Can leptospirosis spread from my dog to my family?+
Related Articles
Find a Groomer That Checks Vaccination Records
Professional groomers require up-to-date vaccination records to keep all dogs in their care safe. Find a trusted groomer near you.
Find a Groomer Near You