Barking
Dogs bark for many reasons, such as when perceived intruders (humans, dogs, or other animals) approach its territory, for identification, when hearing an unfamiliar or unidentified noise, when seeing something that the dog doesn’t expect to be there, or when playing.
Barking also expresses different emotions for a dog, such as loneliness, fear, suspicion, stress, and pleasure. Play or excited barks are often short and sharp, such as when a dog is attempting to get a person or another dog to play.
Dogs generally try to avoid conflict; their vocalizations are part of what communicates to other dogs whether they mean harm or are in a playful mood.
The bark of a distressed or stressed dog is high pitched, atonal, and repetitive (and tends to get higher in pitch as the dog becomes more upset). For example, a dog left home alone and who has separation anxiety might bark in such a way.
Some research has suggested that dogs have separate barks for different animals, including dog, fox, deer, human and cat.
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