Table 1. Definitions of behaviors [23, 44].

Behavior Class	Behavior	Definition
Aggressive Display Behavior	Aggressive grunt	A series of short, rapid grunts being performed by an animal who is seemingly hostile
	Canine display	Facial expression in which an actor's mouth is fully open with teeth, and sometimes gums, exposed and directed toward another animal
	Eyelid flash	An actor lowers eyelids with exposure of white pigment just above the eyes towards the direction of a recipient
	Mantle shake	The rapid shaking of the head and shoulders, oscillating movement of the head and shoulders about the spinal axis
	Multi-aggressive display	General category for rapid agonistic performances, consisting of several agonistic behaviors occurring simultaneously
	Piloerection	Actor's hair is moved from a flat position to a raised position
Initiation of Physical Aggression	Aggressive chase	Aggressive rapid forward movement by an actor towards a recipient who flees
	Attack	An actor sets upon another individual aggressively, initiating a fight
	Bite	The clamping of the mouth on the body of a recipient followed by a pain or fear response from the recipient who is bitten
	Hit	A slap or cuff
Friendly Display Behavior	Chatter (aka friendly grunt)	A series of rapid monosyllabic sounds, usually of low volume
	Lipsmack	Rapid, repetitive opening and closing of lips; may also include rapid, repetitive opening and closing of lips on a flattened and projecting tongue