Canine Distemper and Leptospirosis

Frequently Asked Questions

Why is leptospirosis particularly relevant as a public health concern in the Philippines?
Leptospirosis is a zoonotic disease — it can be transmitted from infected dogs to humans through contact with their urine, blood, or tissues, particularly through broken skin or mucous membranes. In the Philippines, human leptospirosis cases surge during and after flooding events, as floodwater serves as a vector for bacterial spread. Dogs that have been exposed to contaminated environments can carry and shed the bacteria without showing obvious symptoms, making undetected transmission to household members a genuine risk. Annual vaccination and prompt treatment of symptomatic dogs are both preventive public health measures.

What is canine distemper and why is it so dangerous?
Canine distemper is a highly contagious viral disease caused by a paramyxovirus that attacks the respiratory, gastrointestinal, and central nervous systems of dogs. It spreads through airborne droplets and contact with infected animals’ secretions. Young puppies and unvaccinated dogs are the most vulnerable. The disease progresses through respiratory symptoms, digestive upset, and in severe cases, neurological signs including seizures and paralysis. There is no cure — treatment is supportive only — and the mortality rate is significant, particularly in puppies. Vaccination is the only reliable protection.

What is leptospirosis and how does it spread to dogs?
Leptospirosis is a bacterial infection caused by Leptospira organisms that thrive in warm, moist environments. Dogs most commonly become infected through contact with contaminated water — puddles, floodwater, mud, or standing water — or through exposure to the urine of infected animals including rodents and wildlife. In the Philippines’ tropical climate and frequent flooding, leptospirosis is a year-round concern, particularly intensifying during rainy season. The bacteria enter through mucous membranes, skin abrasions, or ingestion of contaminated water.

What are the symptoms of each disease and how can owners tell them apart?
Canine distemper typically begins with eye and nasal discharge, fever, coughing, and lethargy, progressing to vomiting, diarrhea, and eventually neurological symptoms including twitching, incoordination, and seizures. The footpad and nose may harden in later stages. Leptospirosis presents with sudden onset fever, severe lethargy, muscle pain, loss of appetite, vomiting, and rapidly escalating signs of kidney or liver failure — including jaundice (yellowing of skin and eyes), reduced urination, and abdominal pain. Both diseases require immediate veterinary attention, and timely diagnosis is critical to survival.

Are these diseases preventable, and what is the role of vaccination?
Both diseases are vaccine-preventable. Canine distemper is covered by the DHPP combination vaccine routinely given to puppies starting at six to eight weeks of age. Leptospirosis vaccination is available as a separate vaccine or as part of combination formulas. Because leptospirosis immunity from vaccination is shorter-lived than some other vaccines, annual boosters are typically recommended, particularly for dogs with outdoor exposure, contact with water, or access to areas frequented by wildlife and rodents.