Reni's mother was half dragon, Reni (depending on who her dad was) is 1/4 (or just possibly 3/4).
I was thinking of Euchre being 1/64 or less, so the dominant traits he was born with were dilute enough to make him an enhanced Keidran, rather than anything recognisable as a dragon.
That might also explain why, for a Keidran, he's old but not dead yet.
That lore thread made an interesting read, thanks.
Clarification on the chocolate steak thingy:
Chocolate toxicity is related to theobromine concentration, not mass. Terran cats and dogs can't metabolize it, but humans can. White and most milk chocolate may make them ill but not seriously, the stuff I like could kill.
Caffeine is a derivative compound related to theobromine, but it's toxic effects in pets tend to develop faster and be more acute.
Since Keidran in canon can drink coffee without harm, there's a good chance they can safely consume a choccosteak (though if lactose intolerance is a thing with them, they may want to avoid that Hershey-grade brown stuff).