Researchers used non-invasive EEG electrodes to measure brain activity in dogs while the animals listened to human speech. By subtly altering either the consonant or vowel sounds in words, they found that the dogs’ brains responded more strongly when consonants changed than when vowels did.
This preference for consonants over vowels was consistent across the dogs tested, indicating a specific auditory tuning to the more information-dense parts of speech. The study’s authors suggest this may help dogs pick up on familiar words or commands, since consonants often carry more distinguishing weight in many languages.
The findings add to a growing understanding of how dogs process human language. While the study does not prove dogs understand meaning through consonants alone, it shows their auditory system is specially attuned to this feature of speech, setting the stage for future research into canine language perception.