Wolves howl to communicate over large distances, among other things.
A 2023 study on dogs' reactions to howls concluded that howling no longer serves the same purpose unless your dog is from an archaic breed genetically closer to wolves.
Modern dog breeds will certainly employ howling for various purposes after domestication. Common reasons dogs howl include:
Responses to loud noises and high-pitched sounds
Attention-seeking
Separation anxiety
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