Avocados are generally not good for dogs due to the presence of a toxin called persin found in all parts of the avocado plant, including the flesh, pit, skin, and leaves. While the flesh itself is only mildly toxic and a small amount is unlikely to harm most dogs, the pit and skin contain higher concentrations of persin and pose additional risks such as choking or intestinal blockage. Moreover, avocado flesh is high in fat, which can cause gastrointestinal upset or even pancreatitis in dogs if consumed in large amounts. For these reasons, it is safer to avoid feeding avocados to dogs altogether or only give very small amounts of the ripe flesh with caution. Avocado oil, which contains no persin, is safer but should still be given sparingly due to its fat content. In summary, avocados are not recommended for dogs because of toxicity risks from persin, potential choking hazards from pits, and fat content leading to digestive issues. If avocado is to be given, it should be only a small portion of the ripe flesh without skin or pit, and preferably avoided for dogs prone to pancreatitis or sensitive stomachs. Always consult a veterinarian before adding avocado or any new food to a dog's diet.