The Royal Guard Dragons have highly discriminating taste buds and exceptional olfactory sensitivity.
These attributes and what appears to be a natural immunity to all known poisons and toxins resulted in Royal Guard Dragons being used as royal food tasters.
Researchers have found several well documented instances where Royal Guard Dragons serving in this capacity successfully prevented royal family members from eating tainted and in some cases poisoned foods.
An unanticipated consequence of using the Royal Guard Dragons as food tasters was that the Royal Guard Dragons developed a real affinity for human food - especially sweets.