The object of this study was to assess the prevalence of Giardia sp. in domestic canines from the Southern part of Lima, Peru. A total of 204 fecal samples from canines of the districts of Surco, Barranco, Chorrillos, San Juan de Miraflores, Villa María del Triunfo and Villa El Salvador were recolected. The animals were stratified according to the socioeconomic level of the owner. Samples were analized by the direct examination test and by the spontaneous sedimentation test for detection of Giardia sp. The direct examination test showed 8.8 ± 3.9% (18/204) of positive samples whereas the spontaneous sedimentation test gave a prevalence of 15.7 ± 5.0 (32/204). The latter test showed to be more sensitive than the direct examination test when results were compared by the McNemar test. The Logistic Regression test failed to show a significative relationship between presence of Giardia sp. and socioeconomic level of the owner or sex of animal. Puppies (<1 year old) were more affected than adults (>1 year). Likewise, parasitic forms were more frequently detected in soft than in normal feces. The results indicated the existence of a moderate prevalence of Giardia sp. infection in canine population of the Southern part of Lima City, suggesting that canine giardiasis in Lima would be a serious problem of Public Health.Key words: Giardia sp., canine, Lima, spontaneous sedimentation RESUMENEl objetivo del presente estudio fue determinar la prevalencia de Giardia sp. en caninos domésticos en el cono sur de la ciudad de Lima. Se recolectaron 204 muestras de heces de caninos domésticos procedentes de hogares en los distritos de Surco, Barranco, Chorrillos, San Juan de Miraflores, Villa María del Triunfo y Villa El Salvador. Los hogares se estratificaron de acuerdo al nivel socioeconómico de los propietarios. Las muestras se analizaron mediante las técnicas de examen directo y sedimentación espontánea para la detección de Giardia sp. La prueba de examen directo dio el 8.8 ± 3.9% (18/204) de muestras positivas mientras que la prueba de sedimentación espontá-nea dio una prevalencia de 15.7 ± 5.0% (32/204). La técnica de sedimentación espontánea demostró ser más sensible que el examen directo hallándose diferencias estadísticas significativas mediante la prueba de McNemar. La prueba de Regresión Logística no mostró relaciones significativas entre la presencia de Giardia sp. con el nivel socioeconómico de procedencia o el sexo de los canes. Los cachorros (<1 año) fueron más susceptibles que los adultos (≥1 año). Así mismo, las formas parasitarias del orga-
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