|“||Dragon-nip was a perfectly harmless but sleep-inducing substance gathered from the sweat glands of the Loafer Dragon.||”|
|— How to Ride a Dragon's Storm|
There is no description of the Loafer dragon itself. Based on the name, it might be assumed this species of dragon doesn't move around much.
The loafer dragon is able to produce an intoxicating substance from its sweat glands that effects other dragons and humans.
The Loafer dragon is mentioned, but not seen, in this book.