Avocados are a popular fruit that is often enjoyed by humans. However, avocados are toxic to cats and can cause serious health problems. The toxic substance in avocados is persimmonin, which can damage a cat's heart and other organs.

Symptoms of avocado poisoning in cats can include lethargy, difficulty breathing, subcutaneous edema, coughing, and mastitis. In severe cases, avocado poisoning can be fatal.

Even a small amount of avocado can be toxic to cats. It is important to keep avocados away from cats and to never feed them avocados.