The project entitled "Free-ranging domestic dogs and cats in Carlos Botelho State Park (PECB): what are the impacts on wild carnivores and implications for public health?" is part of "Cãoservação Program", which aims at a better environment for wild and domestic carnivores alike and, consequently, for people. This project will be take place in a Conservation Unit in São Paulo State, which contains an important Atlantic Rainforest remnant and has been affected by both the irregular land use and the growth of surrounding neighborhoods. As a consequence, domestic animals are freely roaming the park and its surroundings. Currently, overpopulation of free-ranging domestic dogs and cats is an issue faced by many protected areas, which results in an intimate contact between domestic and wild carnivores. This project aims at characterizing and quantifying the inflow of domestic dogs and cats in PECB, as well as identifying the roaming range of such dogs within the State Park, thus identifying its impacts on wild carnivores, especially the flow of etiological agents. Both the results of such actions in the domestic dog and cat populations and the improvements in health status of the wild carnivores will be assessed two years after the onset of the project. Those results will foster the buildup of a health management and educational proposal for the surroundings of the park aiming at the implementation of permanent public polices to be adopted by the town administration. This proposal will include actions to minimize contact between domestic and wild carnivores, enhance the survival of local wild species and also improve the quality of life for the people living in that region. That proposal should serve as a model for other protected areas facing the same problem.