Well, the perception of weasel varies from era to era and culture to culture...
Weasels look terribly cute but have different symbolic values depending on the era and setting. The Ancient Greeks regard seeing the Weasel crossing your path as bad luck. The omen is worse if you’re an engaged woman; as such, a sighting assures a disastrous wedding. Yet, in the same culture, the Goddess Nemesis shapeshifts into a Weasel when She pursues just retribution.
Meanwhile, in French lore, seeing the Weasel brings good luck. Weasel is a protected animal one should never harm. Medieval European folklore claims the Weasel’s odor is so obnoxious and potent it could kill the monstrous Basilisk: A creature with a snake body and a rooster’s head. Weasel’s hunting ability is also why Christians associate Weasel with Christ; the creature defeats the emblem of evil. In either case, Weasel Spirit embraces courage, watchfulness, and victory over negative influences. For a small, slender critter, the protective attributes of the Weasel are a significant affiliation.