Stress-Related Behaviors in Companion Dogs Exposed to Common Household Noises, and Owners' Interpretations of Their Dogs' Behaviors

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"The frequency, and constancy, of the sounds is an important factor in the dog's reaction. High frequency sounds are believed to be more salient for many species (i.e., attracting greater attention and prompting greater alertness) than lower frequency sounds (31); for example, the cries of a human baby will cause distress to a dog, despite the fact that human infant vocalizations are not of direct evolutionary importance to dogs (32, 33). Dogs' sensitivity to high frequency sounds is greater than humans',"

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https://www.frontiersin.org/article...z_Y5PlkWh5FqwzJ7XjlLMU87ebKsEuw2Tss8qz-bGPvZ4