Dogs were played the sound of humans crying. Their reaction shows a unique emotional bond with us that other animals lack.
Fraga and her colleagues played the same crying and humming sounds ... "I love pigs, but I think it just shows how ...
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Dog trainer shares why you shouldn't give in when dog makes 'complaining' sound
In a video, the dog trainer explains "three different sounds your dogs make, what they mean and how you should ... This means tough love: no treats, no attention - not even eye contact.