Signs of imminent aggression
include direct eye contact, freezing, barking, growling, piloerection (hackles up), baring teeth, and snapping (biting the air).
When you greet people in person for the first time — To make a positive first impression when meeting new people,
include the following as part of your greeting: a warm smile, an introduction that
includes your first and last name, a welcoming comment,
direct eye contact and a firm handshake, if appropriate.