As result of sanitary-helminthological studies it has been found out, that under the conditions of urban agglomeration a great number of dogs, their uncontrolled maintenance and access to various objects induce intensive environmental pollution with zoohelminthologic causative agents and provides a high risk of infection of the population with causative agents of such diseases as toxocariasis++ and echinococcosis. Adherence to sanitary-veterinary rules of dogs maintenance prevents to a significant degree dispersion of the invasion matter in the environment.