FATTY MEATS: Foods high in fat can cause canine pancreatitis and gastroenteritis, serious and potentially fatal conditions. Pancreatitis or inflammation of the pancreas can result in a complete loss of appetite, frequent vomiting, diarrhea that may contain blood, weakness and abdominal pain (apparent through whimpering and restlessness). The reactions can range from barely noticeable to a severe shock-like collapse that can result in death. These conditions can occur after raids on garbage cans, also. Gastroenteritis is inflammation of the stomach and intestines' lining and has similar symptoms. These cases often require hospitalization and fluid relacement.
OTHERS: Avocado leaves and unripe stems, rhubarb leaves, spinach leaves and tomato vines can cause trembling and convulsions.
Salt and Pepper can also be harmful.