 Food is often easy to come by, allowing dogs the luxury of being selective.The reduced need to compete for food has contributed to stable social behavior, although incidents in which humans were harmed by packs of dogs have been known to occur, particularly in less urban areas.According to Alexei Vereshchagin, a graduate student of Poyarkov's who has studied them, the dogs generally go out of their way to avoid conflict with humans, and rarely defecate in busy areas or onto pavements.