Query: What part of the avocado is most dangerous or contains the most persin?
Context: The pit, skin, and leaves of the avocado contain the highest concentrations of persin, making them the most dangerous parts for dogs. While the flesh of the avocado also contains persin, the levels are significantly lower. It is important to prevent dogs from accessing any part of the avocado plant, especially the pit, to minimize the risk of toxicity and potential hazards, such as intestinal blockage.