5. ChocolateDark chocolate is the most toxic to cats but all types of chocolate should completely be avoided. Watch out for desserts left on countertops or drinks that contain chocolate and dairy. If you think your cat consumed chocolate bring them to the veterinarian. If you notice your cat is extremely thirsty, restless, having muscle tremors, vomiting, very hot or has an irregular heartbeat, these signs could indicate your cat has consumed chocolate.