6 Caffeine

Never share your tea or coffee with your cat. Drinks and foods that contain caffeine could be dangerous for cats and a poisonous substance that can be life-threatening if ingested in large quantities.

Caffeine works as a diuretic causing dehydration. It also stimulates the heart and nervous system. Caffeine becomes toxic when ingested by the cat, leading to vomiting, increased thirst, and restlessness.