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Avocado
Persea americana
Avocado is toxic to cats primarily because of persin, a fungicidal compound the avocado tree produces as a natural defense. While humans metabolise persin safely, cats lack this ability. Persin triggers dangerous fluid accumulation (edema) in the lungs, chest cavity, abdomen, and around the heart, causing respiratory distress and, at high doses, myocardial necrosis (death of heart muscle tissue). The plant's extremely high fat content creates an additional hazard by triggering acute pancreatitis even when persin levels are low.
Important Notes
Symptoms: Vomiting, diarrhea, abdominal pain; difficulty breathing and respiratory distress from lung fluid; lethargy, weakness, and abdominal swelling.
Physical hazard: The pit is a severe choking and obstruction risk if swallowed.
All parts are dangerous: Leaves carry the highest persin concentration and are considered most toxic; skin, bark, and pit also contain high levels. The fruit flesh contains only trace amounts of persin but is still risky due to its high fat content.
Potentially Toxic Parts
All parts of the plant
Leaves
Possible Symptoms Reported in Cats
Labored Breathing (Dyspnea), Coughing, and Fluid Accumulation (Edema/Congestion)
Respiratory · 12–24 hours after ingestion.
Choking or Intestinal Blockage
Gastrointestinal · Immediate (if choking) to days (if intestinal blockage occurs).
Pancreatitis (Inflammation of the Pancreas)
Gastrointestinal · Variable; symptoms like abdominal pain and vomiting often appear within 24–72 hours after ingesting
Vomiting, Diarrhea, and Abdominal Discomfort
Gastrointestinal · Clinical signs may be evident within 24 hours (usually after 12 hours).
Lethargy and Depression
Neurological · Within 24 hours.
Fluid accumulation around the heart and myocardial damage
Cardiac
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.