Persimmon — Food safety facts
Do not feed · Dogs · full breakdown on the linked food page
Listed by ASPCA as toxic: unripe fruit and seeds can cause stomach upset, and the flesh may form a blockage in the gut.
Short answer
Yes, persimmon is toxic to dogs and you need immediate veterinary attention. Both the unripe fruit and the seeds can irritate the stomach and cause vomiting, diarrhea, or abdominal pain, and the flesh can create a blockage in the intestines. If your dog is showing any signs of gastrointestinal upset, difficulty passing stool, or seems uncomfortable, do not wait. Call your veterinarian right away or contact the ASPCA Animal Poison Control Center at 888‑426‑4435 for emergency guidance.