Melancholia agressiva

Melancholia agressiva was a mood-altering condition that made certain species melancholic, such as the early death dog, a non-sentient predator.

Behind the scenes
Melancholia agressiva was mentioned in a one-page entry for the early death dog written by Bob Carrau for the 1993 book Monsters and Aliens from George Lucas, a publication that combines creature designs and photographs from various George Lucas projects with original text by Carrau. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.