Some parasites – like hookworms – in dog poop can also infect humans, causing cramps, diarrhea, intestinal illness and serious kidney disorders. These pesky organisms can be resilient, too; Giardia can endure through extreme temperatures, while roundworms may live up to four years in soil. The safest way to handle dog feces is to dispose of it in specified trashcans – or let us dispose of it for you. Landfills are designed to handle dog waste. Your yard isn’t.