Cats are psychopaths because they descend from savage ancestors.
Scientists believe that all felines are a little bit crazy due to their wildcat lineage, which sets them apart from the human race and makes them more skilled at finding food, territory and other moggies to mate with.
Researchers have developed a scale that pet owners can use to measure the level of craziness in their kitty.
The 46-question quiz uses the same model that assesses whether humans are psychopaths.
Lead researcher Rebecca Evans, from the University of Liverpool, said: "We believe that like any other personality trait, psychopathy is on a continuum, where some cats will score more highly than others.
"It is likely that all cats have an element of psychopathy as it would have once been helpful for their ancestors in terms of acquiring resources – e.g. food, territory, mating opportunities."