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Published 23:46 1 Feb 2016 GMT

When the ten minutes were up, he took another sample from the animals, to test it for the presence of the love hormone, oxytocin.
According to Express UK, the level of oxytocin was up 57.2 per cent for dogs while cats only showed a 12 per cent increase in the hormone.
“I was really surprised to discover that dogs produced such high levels of oxytocin. The dog level of 57.2 per cent is a very powerful response" said Zak.
The BBC documentary, entitled Cats v. Dogs, is due to air this Thursday.
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