Dogs are intensely jealous creatures that experience a range of complex human-like emotions, scientists said today.
Researchers at the University of Portsmouth believe that the new study challenges long-held scientific beliefs that only humans and chimpanzees were able to experience secondary emotions.
Psychologist Dr Paul Morris and colleague Christine Doe asked 1,000 domestic animal owners to examine and keep a note of their pet's behaviour.
Dr Morris, an animal behaviour expert, said that the results provided strong evidence that dogs feel intense pangs of jealousy and animosity when in a 'love triangle' involving their carer and another person.
He added that the study had provided consistent reports and video evidence that dogs act as 'uninvited chaperones' when their owners were sharing romantic moments.
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