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Objective: To analyze, through mathematical modeling, the potential ability of sterilization campaigns to reduce the population density of pet dogs., Methods: Mathematical models were constructed to simulate the canine population dynamics and project the results of control strategies based on several sterilization rates., Results: Even at high sterilization rates (for example, 0.80 year(-1)), it would take approximately 5 years to reduce density by 20%. Even so, other sources of population growth, such as the importing of dogs from other geographic areas, could outweigh the effects of a sterilization program., Conclusions: A program's effectiveness is contingent upon not only on the sterilization rate, but also the rate of population growth. Sterilization campaigns may potentially reduce population density, but this reduction may not be immediately evident.

Based on the need to establish animal welfare policies and public health promotion due to the importance of stray animals in the transmission of zoonoses, the objective was to study the population dynamics of homeless dogs in the city of Descalvado - SP, the perception of citizens related to the cause of animal protection and also to the current Federal, State and Municipal legislation. To account for the separation of urban and rural sectors, the Clip tool of the Qgis program was used, sectoring the municipality of Descalvado into North, South, East, West, Central and Industrial District. For the application of the questionnaires, 0.5% of the population from each established area of the municipality was selected and the findings were correlated with existing legislation and public policies, analyzing their effectiveness. As we can see, in summary, the interviewees demand from the local government for improvements, but also, greater responsibility of the population. In addition to the qualitative analysis through the reading and perception of the reports, an analysis of the repetition of key words was carried out, through the creation of the word cloud, an important tool that highlights the terms most cited by the people interviewed, of which "oversight, laws and awareness", revealing the need for public policy directions. The data lead us to conclude that despite the existence of legislation, there is still little application of penalties. In the city, the areas with the highest rate of stray dogs were West and South, peripheral regions and with low-income population. [ABSTRACT FROM AUTHOR]

Objective. To analyze, through mathematical modeling, the potential ability of sterilization campaigns to reduce the population density of pet dogs. Methods. Mathematical models were constructed to simulate the canine population dynamics and project the results of control strategies based on several sterilization rates. Results. Even at high sterilization rates (for example, 0.80 year-1), it would take approximately 5 years to reduce density by 20%. Even so, other sources of population growth, such as the importing of dogs from other geographic areas, could outweigh the effects of a sterilization program. Conclusions. A program's effectiveness is contingent upon not only on the sterilization rate, but also the rate of population growth. Sterilization campaigns may potentially reduce population density, but this reduction may not be immediately evident. [ABSTRACT FROM AUTHOR]