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The importance of synanthropic reservoirs in the epidemiology of metaxenic diseases plays an important role in field studies. Dogs, being the domestic animals that commonly cohabit with the human being in both rural and urban areas, play a fundamental role as reservoirs of blood and tissue protozoa. The migration of the human and its invasion to areas inhabited mainly by natural reservoirs and vectors of Trypanosomatids like Leishmania and Trypanosoma has increased the risk of contracting blood or tissue infection. The present study reveals firstly the seroprevalence of both parasites in canids that coexist openly with the population and in turn are part of the natural fauna of the place (synanthropic reservoir) and secondly the existing co-infection between Leishmania sp in the studied dogs. Were collected 100 blood samples from canids close to the human and were tested for anti T. cruzi antibodies and anti- Leishmania first with two standard tests, ELISA and Indirect Hemagglutination (HAI) for T. cruzi and Immunochromatographic Test for Leishmania (SD bioline Leishmania Ab), whose results were not convincing. The enzyme superoxydodismutase (SODe) excreted by T. cruzi parasites and Leishmania species present in the endemic region (L. mexicana mexicana, L. infantum chagasi and L. braziliensis braziliensis). The results obtained reveal a seroprevalence of 20% for T.cruzi, 15% for L. mexicana mexicana, 2% for L. infantum chagasi and 11% for L. braziliensis braziliensis and a coinfection between L. mexicana mexicana/L. braziliensis braziliensis and L. mexicana mexicana/T. cruzi and less frequent, coinfection among L. braziliensis braziliensis/T. cruzi with percentage values of 4%, 4% and 2% respectively.