Veterinary parasitology focuses more particularly on the parasites responsible for diseases or economic loss in livestock, including parasitic diseases transmissible from animals to humans. The current situation is the study of hydatid cysts in ruminants (cattle, sheep, goats). Larval cestodosis due to the tapeworms of dogs, little study carried out in Algeria since the 1980s, a dark diagnosis, the treatment used by our veterinary practitioners is based on clinical suspicions due to the lack of laboratory specialized in the determination of parasitoses of a In General. This collection of articles aims at defining the epidemiological situation of the hydatid cyst since 2007-2010 on several animal species, then we carried out an analytical study affecting both the fertility and the morphology of the hydatid cyst and this in several compartments of Algeria, a situation of slaughterhouses was also approached to look for the origin of the persistence of E. granulosus. Other articles will be published shortly to investigate the hydatid cyst in the camelina species.