Yes, some fruits can be toxic to dogs. Grapes and raisins are particularly harmful and can cause kidney failure in dogs. Avocados contain persin, which can be toxic in large amounts. Cherries, especially the pits and stems, contain cyanide and can be dangerous. Citrus fruits like lemons and oranges might cause stomach upset. My experience emphasizes caution and avoiding feeding these fruits to dogs. Even though certain fruits are safe, moderation is key. Always remove seeds, pits, and peels, and introduce new fruits gradually to monitor any adverse reactions. As a responsible pet owner, consulting a vet for guidance on suitable fruits for dogs is always recommended.