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Dog lovers have since time began that pets jealous, but now a new study has that it is true. A professor from the University of California research into what makes dogs jealous. Dr Christine Harris first decided to canine jealousy after she strange behaviour among her parents' three border collies. She that when she stroked two of the pooches at the same time, they became aggressive towards each other. Both dogs tried to her hand away from the other so they could receive maximum attention. She said: "To me, that really fit with the core motivation of jealousy….I was them with both my hands, not just one. They exclusive attention. That got me to thinking about jealousy in dogs."

Professor Harris a jealousy test commonly used on young children. Her research team conducted tests on 36 different dogs in their homes and their reactions. The dogs' owner had to a short passage from a book while petting a toy dog that its tail and a Halloween lantern. Harris to see how the dogs to their owner petting the toy dog, as well as looking at if they had any reaction to the petting of the lantern. She that the dogs were twice as likely to be jealous of the toy dog. A third of the dogs tried to in between the toy and its owner. Professor Harris thinks it is important to jealousy more. She said: "Jealousy the third-leading cause of non-accidental homicide across cultures."