Aucuba Marmorata can be toxic. Fungal leaf spot, southern blight sometimes occurs. It can cause a burning sensation in the mouth, as well as liver damage and possible seizures. When adding greenery to your home, just be sure to get plants that are pet-safe, like spider plants, violets or orchids, suggests Dr. Hohenaus. Home / BeWell / The 10 Most Common Poisonous Plants for Dogs. It is hardy in USDA zones 5 to 9. Daffodil toxicity is generally mild to moderate compared with other species on this list of outdoor plants that are poisonous to dogs. Bay leaves can cause excess salivation, vomiting and kidney failure. Rosemary foliage flavors foods and adds a pleasing scent to potpourri.