Dahlias are mildly to moderately toxic to cats and are not safe for them. All parts of the dahlia plant—including flowers, stems, leaves, and tubers—can cause adverse reactions in cats if ingested or through direct contact. Symptoms of dahlia exposure in cats may include nausea, vomiting, diarrhea, loss of appetite, excessive drooling, lethargy, skin irritation, redness, and swelling. While the toxicity is usually not fatal, it can cause significant discomfort and requires veterinary attention if exposure occurs. If a cat encounters dahlias, it is advised to remove any plant material from the cat's reach, monitor for symptoms, and contact a veterinarian promptly. Prevention by avoiding dahlias in areas accessible to cats is the best approach, and pet- safe flower alternatives such as African violets, orchids, spider plants, and catnip are recommended. This classification of dahlia toxicity is supported by the ASPCA and veterinary experts.