Pigs are naturally clean animals that refuse to soil the areas where they eat or sleep.

Research from institutions including the University of Cambridge and the University of Vienna consistently ranks pigs among the most intelligent and hygienic domesticated animals. Studies show that piglets as young as one week old will walk considerable distances from their sleeping areas to eliminate waste. This behavior is an evolutionary adaptation that prevents parasites and diseases from spreading through the herd. In natural or spacious farm environments, pigs establish a strict spatial organization that separates toilet areas from living spaces.The widespread misconception that pigs are dirty stems from their mud-wallowing behavior. Biologically, pigs lack functional eccrine sweat glands needed for evaporative cooling. When temperatures exceed 29°C, they rely on external moisture to regulate body temperature. Mud is more effective than water alone because it evaporates slowly and creates a protective barrier against ultraviolet radiation and biting insects like lice and ticks.Agricultural scientists have documented that pigs confined in factory farm settings with limited space lose their ability to maintain hygiene standards. This forced proximity to waste in intensive farming created the modern stereotype of the "filthy" pig. In reality, pigs possess cognitive abilities comparable to a three-year-old human child. They demonstrate sophisticated social interactions and high self-awareness regarding their personal environment.