| Vital Sign | Behavioral Correlate | |------------|----------------------| | Heart rate ↑ | Fear, pain, excitement | | Pupil dilation | Sympathetic activation (fear, aggression) | | Tachypnea | Stress, heat, pain | | Vocalization | Distress (cat: growl → hiss → yowl; dog: whine → bark → scream) | | Posture | Hunched (pain), crouched (fear), stiff (aggression) |