The berries of the Asparagus fern can cause gastrointestinal distress, with symptoms of vomiting and diarrhea when eaten, and the sap can induce a contact rash.
Center for Companion Animal Health (CCAH) - Dog Health
Racemouse Asparagus Poisoning in Dogs - Symptoms, Causes
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Is Asparagus Fern Poisonous to Dogs?
Ferns Poisoning in Dogs - Symptoms, Causes, Diagnosis, Treatment
Asparagus Fern
Dog Condition Type - Environmental
Dog Condition Area - Mouth
Asparagus Fern Poisoning in Dogs - Symptoms, Causes, Diagnosis
Dog Condition Area - Mouth
Food Hazards - Special Pet Topics - MSD Veterinary Manual
Guide to Managing Toxin Ingestion in Pet Patients
Dog Condition Type - Poisonous
Sprengeri Fern Poisoning in Cats - Symptoms, Causes, Diagnosis