Cats should not eat pine nuts. Pine nuts and other nuts are not suitable for cats. Pine nuts contain high levels of fat and protein, which may not be easily processed by a cat's digestive system. Eating too many may lead to indigestion, diarrhea, vomiting, and other symptoms.

Pine nuts contain cyanide, a substance that is toxic to cats and can cause poisoning symptoms such as headache, dizziness, nausea, vomiting, and even severe symptoms such as difficulty breathing, altered consciousness, and convulsions.