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Darwin was right... dogs really do get jealous

The Telegraph
In The Descent of Man, Charles Darwin noted that "everyone has seen how jealous a dog is of his master's affection if lavished on any other creature."
But since the evolutionary biologist made the observation in 1871, scientists have debated whether animals can actually feel jealousy, with many arguing it is an emotion that only humans exhibit
Now experts believe they have proven that dogs do get jealous when their owners give too much attention to a rival.
The University of California discovered that dogs were far more likely to snap and push at their owners if they felt they were being excluded from their affection.
"Our study suggests not only that dogs do engage in what appear to be jealous behaviours but also that they were seeking to break up the connection between the owner and a seeming rival,” said lead researcher Professor Christine Harris.
"Our results challenge these ideas, showing that animals besides ourselves display strong distress whenever a rival usurps a loved one's affection."
The University of California study used an adapted test for six-month-old babies to monitor the reaction of 36 dogs in their own homes when their owners ignored them in favour of the stuffed dog, which could bark and wag its tail, or a bucket with a Halloween
design.
In a third scenario, owners were asked to read aloud a pop-up book that played tunes.
The dogs were filmed and the video rated for a variety of aggressive; disruptive and attention-seeking behaviour.
The study found the dogs were around twice as likely to push or touch their owner when he or she was petting and talking sweetly to the false dog as when the owner was displaying the same behaviour towards the bucket Even fewer pushed or touched their owner when the book was being read aloud.
Just under a third of the dogs also tried to get between their owner and the stuffed animal and a quarter snapped at the "other dog", with only one doing so at the bucket and book.
Researchers psychology professor Christine Harris, from the University of California San Diego, and former honours student Caroline Provoust said the aggression displayed by the dogs suggested they believed the false dog was real.
They added that 86 per cent of the dogs attempted a spot of bottom-sniffing on the toy dog during and after the experiment, providing additional
evidence that the pets had been duped.
They said the research supported the view that there may be a more basic form of jealousy which evolved as a protection from interlopers into social settings.
Prof Harris said the majority of research so far has been on jealousy between human beings and showed that a great deal of the emotion existed in relationships between siblings, friends and even close colleagues.
The first signs of human jealousy can be seen in babies and young children, she said, suggesting that the emotion may have evolved from siblings competing for family resources and that it is "hard wired" into our consciousness.
”We can't really speak to the dogs' subjective experiences, of course, but it looks as though they were motivated to protect an important social relationship," Prof Harris said.
Both researchers said the study would help further understanding of jealousy, an emotion with far-reaching psychological and social consequences.
The study was published in the journal PLOS One.