This is part of a list that I've put together. It doesn't have plants or medicines listed, but I can add them if anyone wants them. Alcoholic Beverages: Can cause a coma or death. Apple Seeds: Can have varied effects on pets. Apricot Pits: Can cause respiratory difficulties such as breathing, coughing and sneezing. Avocado: The leaves, fruit, seeds and bark of avocados contain Persin, which can cause vomiting and diarrhea in dogs. Can cause congestion, difficulty breathing and fluid accumulation around the heart. Some ingestions may even be fatal. Cherry Pits: Can cause respiratory difficulties such as breathing, coughing and sneezing. Candy containing the sweetener Xylitol: Can cause liver damage and even death. Chocolate: Chocolate poisoning can cause irregular heart rate and rhythm, restlessness, hyperactivity, diarrhea, vomiting, panting, muscle tremors, abdominal pain, bloody urine, increased body temperature, seizures, coma and possibly even death. Coffee: Can result in increased breathing and heart rate, restlessness and affects the central nervous system. Cooked Bones: Can splinter and puncture throat and internal organs. Fat Trimmings: Can cause pancreatitis. Grapes: Large amounts of grapes can be poisonous to pets and can cause vomiting, diarrhea, lethargy, abdominal pain, lack of appetite and kidney damage. Hops: May cause panting, elevated temperature, increased heart rate, seizures and possibly death. Macadamia Nuts: Can cause vomiting Macadamia nuts are commonly used in many cookies and candies. However, they can cause problems for your canine companion. These nuts have caused weakness, depression, vomiting, tremors and hyperthermia in dogs. Signs usually appear within 12 hours of ingestion and last approximately 12 to 48 hours. Moldy Foods: Can have varied effects on pets including vomiting and diarrhea. Mushrooms: Different types of mushrooms can have varied effects on pets such as, depression, diarrhea, nausea and vomiting, abdominal pain, tearing, hallucinations, defecation, liver failure, seizures, drooling, urination, kidney failure, heart damage, hyperactivity and in some cases, death. Mustard Seeds Onions and Onion Powder: Can cause gastrointestinal problems such as vomiting and diarrhea. Peach Pits: Can cause respiratory difficulties such as breathing, coughing and sneezing. Potato Leaves and Stems: Can cause problems with the digestive, nervous and urinary systems. Raisins: Large amounts of raisins can be poisonous to pets and can cause vomiting, diarrhea, lethargy, abdominal pain, lack of appetite and kidney damage. Rhubarb Leaves: Can cause problems with the digestive, nervous and urinary systems. Salt: In large quantities can cause electrolyte imbalances and can produce excessive thirst and urination, or even sodium ion poisoning in pets. Signs that your pet may have eaten too many salty foods include vomiting, diarrhea, depression, tremors, elevated body temperature, seizures and even death. Tea: Contains caffeine. Can cause nervous system problems. Tomato Leaves and Stems: Can cause problems with the digestive, nervous and urinary systems. Walnuts: Can cause gastrointestinal problems such as vomiting and diarrhea, as well as respiratory issues such as sneezing, breathing and coughing. Yeast Dough: Can be dangerous as it will expand and result in gas, pain and possible rupture of the stomach or intestines.