Scientists already know that canines and humans release the love hormone known as oxytocin when they are together.

"We have pretty good evidence that dogs actually love their humans," said US neuroscientist Dr Paul Zak, who conducted the study.

In the study completed for the upcoming documentary 'Cats vs Dogs', Zak took saliva samples from 10 cats and 10 dogs prior to a 10-minute playtime session with their owners. He then took another saliva sample from all of the participants after their playtime encounter, testing it for the presence of oxytocin.

According to the results, a 57.2 percent increase of the hormone oxytocin was found in dogs; whereas a 12 percent increase of the hormone was found in cats.

"From this sample it is true to say that these dogs love their owners five times more than the cats do," Zak was quoted as saying.

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