Rain, Stumpy's nemesis, has been sporting a glow in the dark collar. Stumpy must have mentioned her collar envy to Rain's dad and Alex. They brought one home for Stumpy when the went into town the other day
Stumpy practically glows in the dark
Stumpy, it seems, has also managed to turn it off so she can still move about in stealth mode, when scavenging and rabble rousing.