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Ramiro Joly-Mascheroni at Birkbeck University discovered the\nbehaviour watching how 29 different dogs interacted with a stranger.\nDuring a series of trials, the unfamiliar experimenter would call the\ndogs by name, establish eye contact and then either yawn loudly or\nsilently open their mouths.\n

Twenty-one out of the twenty-nine dogs - 72% in total - yawned at\nleast once when the experimenter yawned. But not a single one of them\nyawned when the experimenter merely opened their mouth. This stark\ncontrast strongly suggests that the dogs were actually 'catching' the\nhuman yawns.