The purpose of the study was to conduct assessment of the age and gender of the population of stray dogs of the city of Surgut. The objectives were to identify the distribution of stray dogs in the zones of the city, determine the density, set the sex and age composition, to conduct the forecast of growth of the dog population. The study of stray dogs in the city of Surgut, conducted in April 2014 to April 2015 was taken into account of 1515 of individuals homeless and neglected dogs. The study focus was directed at homeless and domestic (arbitrary and semiarbitrary detention) dogs. The high density of dogs registered in the area of lowrise (from 16.6 individuals / Km2 in the fall to 19.2 in the winter) and in the area of gardening (from 15.1 in-dividuals / Km2 in the winter to 41.7 spring). The dominance of males was observed in all areas of the city throughout the year. Sex ratio varied from 2.5: 1 to 3: 1 (males and females respectively). The age structure was mostly represented by adults: most likely the young (over one year) and probably old (representing the reproductive value). In the lowrise and industrial zones are also often registered puppies. In the study period from spring to winter an increase in the number of lactating females and pups was observed. The litter was registered from one to eight individuals. For the city of Surgut, the average number of pups per litter was from 2.4 to 3.2 individuals. Among other things, we know that the results of irrevocable trapping dogs by Surgut's municipal unitary communal enterprise for 2014 amounted to 2.450 individuals, as well as 2 months of 2015 gave more than 542 individuals. Thus, at present the population of stray dogs is low, but the number may change in the coming years.