Avocado is poisonous to some animals. It contains Persin. The primary concern with avocado in dogs and cats is gastrointestinal upset, namely vomiting and diarrhea, but we know that some dogs and cats do eat avocado without having adverse reactions. Birds, rabbits, and some large animals are especially sensitive to avocados, as they can have respiratory distress, congestion, fluid accumulation around the heart, and even death from consuming avocado. In short, I would not recommend avocados for dogs, cats, or other pets.