Ключевые слова: aggression, alertness, animal aggression, animal behavior, animal sounds, barking, barking dogs, canine, challenge, communication, companion animals, conflict, confrontation, daylight, dog behavior, dogs, domestic animals, domestic pets, expressive, fences, furry, intensity, interaction, neighborhood, outdoor scene, outdoors, park, pet communication, pet interaction, pet rivalry, pets, posture, territory, two dogs, vocalization,