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A wide variety species of intestinal protozoa and helminthes are pathogen for the domestic animals. Between April and November 2009, a study was done with the purpose of determining the enteric parasitic infection in dogs (Cannis familiaris), 96 dogs (58 males and 38 females) with owner of 10 species, one hybrid, eight age groups in two seasons of the urban area of the Coroico town, Nor Yungas, department of La Paz, Bolivia. The coproparasitology diagnostic was made by direct examination, with the Willis-Molloy flotation simple technique with a solution oversaturated of sodium chloride. It was detected one or more species of helminthes and protozoa, was used the chi-square and descriptive method for the statistical analysis. The results were: from the 96 sampled dogs, in 87% is present at less one type of parasitic shape, were identify: Ancylostoma spp, Toxocara canis, Strogyloides spp, Giardia spp, Isospora canis, Trichuris vulpis, Ancylostoma spp/Uncinaria spp and Dipylidium caninum. The evaluation by season show a (p ≤ 0,05) for the Giardia spp. In a humidity season, but not for a dry season, the rest of parasites can be found in both seasons. By sex in a humidity season T.canis in females 43% and 22% in males, in dry season by sex was found T.vulpis in female with a high frequency (p ≤ 0,05), the rest of parasites do not show statistic differences in both seasons. By age in dry season T. canis and Stronyiloides sp. prevails 1-24 months and 49-72 months respectively, in a humidity season T. canis prevails in the same age (p ≤ 0,05). By race in dry season Ancylostoma spp Uncinaria spp prevails in the race Pekingese, in humidity season Strongyloides sp prevails in the Cocker race. Prevail in both seasons A. canis y T. canis. In relation to the mono-parasitism and multi-parasitism, was viewed, in both seasons the dogs multi-parasitism are more than the mono-parasitism.

The study on the relative abundance of Amblyomma Boophilus microplus & cajennense was conducted in 32 colonies, divided into two ecological zones (ZE) and two rainfall regimes in the area of Yucumo, Beni, Bolivia. Visits were made every twenty day to collect mite of cattle population using the method of demolition. The total number of mite was considered, the total number of ectoparasites sampled from each animal and all animals were added to each colony sampled, the value of each animal was divided it between all the animals of each colony to determine the average number of ticks per colony. Was detected B. microplus in all the colonies, during the months of May to October (2008). Statistical analysis was done for comparison of means and no differences were found between ZE, colonies for Boophilus microplus, Amblyomma cajennense as is found in association with the Boophilus microplus on the prairie. Although there were no differences between production systems, it emphasizes that the relative frequency of infestation of cattle in the ZE studied is very similar except for the colony August 6 ZE corresponding to the ridge which has elevated mite per animal. The need is to develop work which show the diversity of this important group of arthropods in the settlement area Yucumo, General José Province Ballivián, Beni, Bolivia, taking into account the possibility that these cause public health problems not only in animals, but that they affect humans.