Can I give a cooked oyster to my 5 kg miniature poodle, or is it too risky for a small dog?

Yes, a single, plain, thoroughly cooked oyster is generally safe for a small dog as an occasional tiny treat. The risk isn't about toxicity but about portion size and preparation — a whole oyster is a large mouthful for a 5 kg dog and could be a choking hazard or cause an upset stomach if they're not used to it. Always cook oysters fully to kill bacteria, never feed raw, and chop it into pea-sized pieces. Monitor for any digestive issues afterward.