Leptospirosis in Dogs: Symptoms, Treatment & Prevention Guide

What is Leptospirosis?

Leptospirosis is a bacterial disease caused by Leptospira bacteria. It affects both animals and humans (zoonotic) and is one of the most common zoonotic diseases worldwide. The bacteria thrive in warm, wet environments and are transmitted through contaminated water and soil.

How Dogs Get Leptospirosis

• Contaminated water: Drinking or swimming in lakes, ponds, streams
• Wildlife urine: Raccoons, skunks, opossums, rats, deer
• Contaminated soil: Bacteria survive for weeks in moist environments
• Direct contact with infected animals

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Symptoms

Early Stage (4-12 days post-exposure)

• Fever (103-105°F)
• Shivering and muscle tenderness
• Lethargy
• Loss of appetite
• Increased thirst and urination

Progressive Signs

• Vomiting and diarrhea
• Jaundice (yellow gums, skin, eyes)
• Dark or bloody urine
• Dehydration
• Bleeding disorders (nosebleeds, bruising)

Severe Stage

• Kidney failure (most common serious outcome)
• Liver failure
• Bleeding disorders (DIC)
• Death (if untreated)

Who Is at Risk?

• Outdoor dogs near water sources
• Hunting and sporting dogs
• Dogs in rural or suburban areas with wildlife
• Dogs in warm, wet climates
• All breeds and ages (not just rural dogs)

Diagnosis & Costs

Diagnostic Tests

• Physical exam: $50-100
• CBC and chemistry panel: $150-300 (kidney and liver values)
• Urinalysis: $60-120
• Leptospirosis PCR (blood and urine): $150-300
• Microscopic Agglutination Test (MAT): $100-250
• Ultrasound (kidney/liver assessment): $200-500

Total Diagnostic Cost: $300-1,000

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Treatment

Hospitalization (1-2 weeks)

• IV fluids (kidney support): $100-200/day
• Antibiotics (doxycycline + penicillin): $50-100/day
• Anti-nausea medications: $30-60/day
• Kidney support medications: $50-100/day
• Blood transfusion (if bleeding disorders): $200-500
• Dialysis (severe kidney failure): $500-1,000/day

Total Treatment Cost

• Mild case: $500-$2,000
• Moderate case: $2,000-$5,000
• Severe case with kidney failure: $5,000-$10,000+

Prevention

Vaccination

• Leptospirosis vaccine: $25-50 per dose
• Initial series: Two doses, 3-4 weeks apart
• Annual booster required
• Protects against 4 serovars (canicola, icterohaemorrhagiae, grippotyphosa, pomona)
• Not 100% protective but reduces severity

Management

• Avoid standing water (ponds, puddles, lakes)
• Control wildlife in your yard
• Vaccinate before outdoor activities
• Wear gloves when handling infected dogs (zoonotic risk)

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Zoonotic Risk

Leptospirosis is transmissible to humans. Owners of infected dogs should:

• Wear gloves when cleaning up urine
• Wash hands thoroughly
• Disinfect contaminated areas with bleach
• Monitor family members for flu-like symptoms

Survival Rates

• With prompt treatment: 80-90% survival
• Untreated: 10-20% survival
• With kidney failure: 50-60% survival

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Related: giardia, gastrointestinal-issues, kidney-disease