Social problems can originate with resident and non-resident cats.
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In areas of high cat population density, non-resident cats may compete with resident cats for outdoor space and latrine sites. They may even enter the home to steal food, which not only depletes resources for the resident cats but may also deter them for accessing other nearby resources (such as a litter tray). A secure, coded cat door that prevents access by non-resident cats should be installed. It should be fitted with an opaque door, or the door should be painted or covered with film so that non-residents cannot see into the house.
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Conflict between resident cats can be identified using the interaction diagram shown in the overview section on housesoiling problems.