While the fleshy part of oranges is not toxic to dogs and contains beneficial vitamins, it is high in sugar and can cause gastrointestinal upset if consumed in large quantities. The peel, seeds, and pith are difficult to digest and can lead to digestive issues or even choking hazards. It's best to offer oranges sparingly and remove all non-flesh components.
Disclaimer: This information is for educational purposes only. Always consult your veterinarian before making changes to your pet's diet.