There are a few different types of bulbs that can be harmful to dogs if ingested. The most common type is the tulip bulb, which contains a poisonous substance called lycorine. Other types of bulbs that contain this toxin include daffodils, jonquils, and amaryllis. If your dog ingests any of these bulbs, they may experience vomiting, diarrhea, and abdominal pain. In severe cases, it can lead to kidney damage or even death. If you think your dog has eaten any type of bulb, it's important to take them to the vet immediately for treatment.