While small amounts of fresh coconut flesh are generally safe for dogs, the high fat content can lead to gastrointestinal upset, including diarrhea and vomiting. The husk and shell pose a choking hazard and can cause intestinal obstruction. Coconut water contains high levels of potassium, which can be problematic in large quantities.
Disclaimer: This information is for educational purposes only. Always consult your veterinarian before making changes to your pet's diet.