Leaf piles and fallen leaves can pose hidden dangers for pets. Wet leaves can create slippery surfaces, increasing the chance of falls. Additionally, leaves may conceal sharp objects like sticks or debris that can injure paws, or insects that could bite or sting. Prolonged exposure to damp leaves may also cause skin irritations. For safety, it's recommended to monitor where pets walk and clean their paws after outdoor activity to prevent discomfort or potential issues.