Leishmaniasis in Dogs: Causes, Symptoms, and Treatment

What is leishmaniasis in dogs?

Leishmaniasis is a systemic infectious disease caused by Leishmania parasites that can be life-threatening in dogs. It is transmitted through the bite of infected sand flies (Phlebotomus species)—tiny, crepuscular insects found in Southern Europe, North Africa, the Middle East, and parts of South America. In Germany itself, no native sandfly species transmits Leishmania; the risk arises from travel to endemic areas or from dogs originating from these regions.

The parasites infect macrophages and multiply within the cells. The result is a chronic, progressive immunodeficiency that affects nearly all organ systems. Without treatment, the disease can be fatal.

Background + Scientific Context

Solano-Gallego et al. (2011, *Parasites & Vectors*, PubMed 21496350) published the LeishVet guidelines, which are now the international standard for the diagnosis, classification, and treatment of canine leishmaniasis. The guidelines established a four-stage staging system (Stages I–IV) based on clinical and laboratory parameters—crucial for treatment planning and prognosis assessment. Stage I (mild, seropositive) has a good prognosis; Stage IV (severe organ involvement) requires intensive treatment with an uncertain outcome.

Otranto and Dantas-Torres (2013, Trends in Parasitology, PubMed 23786827) analyzed prevention strategies for leishmaniasis in dogs and their public health implications: Dogs are the primary reservoir for Leishmania infantum —which causes visceral leishmaniasis in humans. Vector prevention (repellents, insecticides applied to collars) has been shown to reduce the transmission rate; the available vaccine (CaniLeish/Letifend) does not provide sterile immunity, but it does reduce the risk of symptoms and the parasite burden.

Miró et al. (2008, Trends in Parasitology, PubMed 18468953) described the spread of leishmaniasis as a growing zoonosis in Europe: Due to global warming and increased travel, sand fly populations are expanding northward—isolated cases have now been documented in northern Spain, southern France, and sporadically in Germany. Screening imported dogs is a public health measure.

Vitomalia-Position

Leishmaniasis is not just an abstract vacation risk—it is a serious condition that requires lifelong management. Dogs from the Mediterranean region or with a history of travel to endemic areas should be tested regularly, even if they appear symptom-free. Early detection and consistent staging are crucial—don’t wait to treat the dog until it is obviously sick.

When does leishmaniasis become a concern?

• Traveling with a dog to areas where the disease is endemic (the Mediterranean region, Portugal, the Balkans, Turkey, North Africa)
• Adopting or buying a dog from abroad
• Newly developed skin, kidney, or eye symptoms in a dog with a history of travel
• Precautions and preventive measures before and after travel to high-risk areas

Practical application

Leishmania staging according to LeishVet:

Prevention: - Repellent collars (deltamethrin, permethrin) or spot-on treatments in endemic areas - Vaccination (Letifend, CaniLeish) — reduces the risk of symptoms, but does not provide 100% protection - Protection at dusk and at night: Mosquitoes are active at temperatures above 18°C - Entry screening following a stay in high-risk areas (antibody test after 6–12 weeks)

Common Mistakes & Myths

• “My dog was only in Spain for a short time—the risk is minimal.” A single bite is enough for transmission. Short trips to high-risk areas (parts of Catalonia, Andalusia, and the Portuguese Algarve) pose a significant risk of exposure—especially without vector protection.
• "Leishmaniasis is curable." Leishmania parasites are not completely eliminated. Treatment leads to clinical remission and reduces the parasite burden, but the disease requires lifelong monitoring and often long-term medication with allopurinol.
• “The dog looks healthy—it isn’t infected.” The incubation period ranges from months to years. Seropositive dogs can remain asymptomatic for a long time, yet still be capable of transmitting the virus and develop gradual organ damage.

Current State of Research (2026)

Canine leishmaniasis is on the rise in Europe—climate change and travel are expanding the sand fly’s range. The LeishVet staging system remains the standard; recent studies are investigating biomarkers for treatment response and the development of resistance to allopurinol. First-generation vaccines offer incomplete but demonstrable protection. For imported dogs, the following applies: consistent screening, early staging, and timely treatment.

Frequently Asked Questions

How can I tell if my dog has leishmaniasis?

Common early signs: weight loss despite a normal appetite, dandruff, and hair loss (especially around the eyes and muzzle), swollen lymph nodes, and nosebleeds. Late-stage signs: kidney problems, eye changes, and deep skin wounds. An antibody test at the veterinarian’s office confirms the diagnosis.

Can my dog contract leishmaniasis in Germany?

There are no established sand fly populations in Germany that act as vectors. The risk of infection arises from travel to endemic areas (the Mediterranean region, Portugal, Turkey, the Balkans) or from contact with infected dogs. Very isolated indigenous cases have been reported, but they do not pose a significant widespread risk.

Is leishmaniasis dangerous to humans?

Leishmania infantum can be transmitted to immunocompromised individuals (people with HIV, those on immunosuppressive medication)—but not through direct contact with dogs, only through the bite of an infected sand fly. In Germany, there is no direct risk of transmission from dogs to humans without the involvement of a vector mosquito.

Related terms

• Tick Prevention for Dogs
• Parasite prevention for dogs
• Motion sickness in dogs
• Infectious Diseases in Dogs
• Vaccinations for Dogs

Sources & Further Reading

1. Solano-Gallego, L., Miró, G., Koutinas, A., Cardoso, L., Pennisi, M. G., Ferrer, L., … Baneth, G. (2011). LeishVet guidelines for the practical management of canine leishmaniosis. Parasites & Vectors, 4, 86. https://pubmed.ncbi.nlm.nih.gov/21496350/

2. Otranto, D., & Dantas-Torres, F. (2013). The prevention of canine leishmaniasis and its impact on public health. Trends in Parasitology, 29(7), 339–345. https://pubmed.ncbi.nlm.nih.gov/23786827/

3. Miró, G., Cardoso, L., Pennisi, M. G., Oliva, G., & Baneth, G. (2008). Canine leishmaniasis — new concepts and insights on an expanding zoonosis: Part two. Trends in Parasitology, 24(8), 371–377. https://pubmed.ncbi.nlm.nih.gov/18468953/