These beautiful flowers grow mostly in the fall and are found in a variety of colors. They look like fluffy puff balls and can therefore be irresistable to pets. Chrysanthemums are a known toxic plant. In fact, some species are grown specifically for use in making commercial grade pesticides. Because of this, it is best to keep your pet away from these plants. Eating a small amount of this plant can cause some minor GI discomfort and signs such as diarrhea and vomiting. If a large amount of these flowers have been ingested, it is best to seek veterinary care for supportive treatment.