Namely, the entire daffodil plant is poisonous, with the bulb being the most dangerous as it contains the highest concentration of lycorine. This is an alkaloid compound that causes vomiting in dogs. This compound is also found in hyacinths, which are toxic to dogs. Although you don't need to avoid walking in areas where daffodils grow, increased caution is necessary to prevent your dog from being tempted to eat or chew them. Symptoms of lycorine poisoning depend on the amount ingested by the dog. The first signs are usually digestive issues. Shortly after ingestion, dogs may experience increased drooling, followed by vomiting, diarrhea, bloating, and lethargy. In more severe cases, irregular heart function, breathing problems, and severe abdominal pain may occur. Symptoms appear within a few hours of consumption, but this can vary depending on the amount of flowers and the size of the dog. If you suspect your dog has eaten a daffodil, even in a small amount, it is necessary to take it to a veterinarian.