Types of Poisoning in dogs and cats Types of Poisoning Symptoms in Dogs and Cats Gastrointestinal Poisoning Symptoms Gastrointestinal symptoms, including loss of appetite and vomiting, result from eating poisons like garbage or lead paint and from toxic plants, such as English ivy and English holly. Diarrhea is caused by eating garbage, medications, some snake bites, chocolate, and many toxic plants, including Chinaberry, iris, poinsettia, pokeweed and daphne. Seizures and Neurologic Poisoning Symptoms Seizures and neurologic symptoms are caused by several poisons including strychnine, tobacco, aspirin, antidepressants, alcohol, marijuana, flea repellents, insecticides, gasoline, drain cleaners, dishwasher detergent, and furniture polish. Some frogs, toads, spiders, and snakes also cause seizures in pets, including Coral snakes, the Florida marine toad, the Colorado River toad and the brown recluse spider. Some plants also cause neurologic symptoms, including horse chestnuts and buckeyes. Bleeding and Anaemia From Poisoning Bruising, nosebleeds, blood in the stool, and anaemia are caused by rat and mouse poisons. Excessive amounts of onions and garlic, sweet clover, and bracken fern also cause anaemia and possible death. Heart Symptoms From Poisoning Irregular heart rhythm and cardiac symptoms are caused by many medications and plants including oleander, milkweed, jimson weed, kalanchoe, and mountain laurel. Kidney Symptoms From Poisoning Kidney failure and the inability to produce urine is caused by antifreeze poisoning. Many plants cause kidney damage, including caladium, pigweed, dieffenbachia, Easter lily, and philodendron. Liver Symptoms From Poisoning Liver damage is caused by many medications including acetaminophen (Tylenol) and by many plants including tansy ragwort and rattlebox.