Dogs look like their owners - it's a scientific fact.

Michael Roy at the University of California, San Diego was one of the first psychologists to put the idea to the test. Going to three nearby dog parks, he photographed the pooches and the owners separately, and then asked a group of participants to try to match them up. Despite no additional cues, he found that they were able to work out who lived with whom with reasonable accuracy. The result has since been repeated many times. (Importantly, the resemblance may be slight but noticeable; not all bulldog owners will look like their faces have been squeezed through a wringer.)