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Dogs belong to the group of animals that were the first to be domesticated. They live in cohabitation with humans and share their environment much more intimately than any other animal specie. The close contact between strays and pets, on the one side, and the pollution of urban areas with the feces of these animals, on the other, close the chain of infection with parasites, which jeopardizes also human health in the final link of that chain. Dogs are carriers and the true hosts to large numbers of species of zoonotic parasites - Cryptosporidium parvum, Giardia lamblia, Echinoccocus granulosus, Dipyllidium caninum, Toxocara canis, Ancylostomidae spp. and others, whose eggs or other developmental forms they eliminate into the environment through feces. The increase in the number of cases of toxocarosis in humans (syndrome of visceral larvae migrans), ancylostomosis (cutanea larvae migrans), hydatidosis, toxoplasmosis, or cryptosporidiosis are the best indicators of these relations. In order to resolve this problem, it is necessary to conduct systematic investigations of their parasitic fauna with the maximum cooperation of the animal owners, compulsory health education of the population in the area of the diseases that are transferred from animals to humans, and, certainly, carrying out the dehelminthization of dogs. Psi pripadaju grupi najranije pripitomljenih životinja. Oni sa čovekom žive u kohabitaciji i dele životnu okolinu mnogo intimnije od ma koje druge životinjske vrste. Blizak kontakt lutalica i ljubimaca, s jedne i polucija gradskih površina zagađenih fecesom ovih životinja, s druge strane, zatvaraju lanac infekcije parazitima, kojima je u konačnom nizu ugroženo i ljudsko zdravlje. Psi su nosioci i pravi domaćini velikog broja zoonoznih vrsta parazita - Cryptosporidium parvum, Giardia lamblia, Echinoccocus granulosus, Dipyllidium caninum, Toxocara canis, Ancylostomitidae spp. i drugih, čija jaja ili druge razvojne oblike eliminištu fecesom u spoljašnju sredinu. Porast slučajeva toksokaroze ljudi (sindrom visceralne larve migrans), ankilostomoze (kutana larva migrans), hidatidoze, toksoplazmoze ili kriptosporidioze su najbolji pokazatelj ovih relacija. Radi rešenja ovog problema neophodno je sistematsko istraživanje njihove parazitofaune uz najveću moguću saradnju vlasnika životinja, obavezno zdravstveno prosvećivanje stanovništva na polju oboljenja koja se prenose sa životinja na ljude i svakako sprovođenje dehelmintizacije pasa.