Sago Palms are a very popular species of palms here in Florida, but they pose a huge risk for our pets. The seeds of the Sago Palm are the most toxic part of the plant, but the whole plant is toxic. The most serious side effect of Sago Palm ingestion is liver failure, but it can also cause vomiting, diarrhea, lethargy, and black tarry stool which are also concerning. Its important to contact your veterinarian or pet poison control if you suspect your pet has ingested any part of a Sago Palm.