Loki was a UPS driver because UPS drivers are scary. Sammy was a ninja, AKA a SAM-urai, because of her ninja fighting moves. Think “Teenage Mutant Ninja Yorkie”
They wore these for all of 3 minutes, but they posed for pictures! Loki was quickly bored with Halloween when he realized 1. the candy was not dog treats and 2. kids aren't that scary, except for the Power Ranger with the blinking helmet.
SAMMY, on the other hand, thought it was the coolest thing ever because she LOVES kids. And of course she thought the only reason they stopped by was to pet her!