If your cat  is warm, friendly and predictable, you probably have nothing to worry about. However, if your cat disappears without warning and returns unexpectedly or does things that seem odd or mysterious, it may have a double life as a spy.

Spy cats come in all sizes and breeds, so you never know if your furry pet is a spy and what its mission is.

Sometimes it's spying on other animals. Other times, it may be spying on you. Why spy cats gather intelligence and what they do with it is unknown.

One plausible theory is they use the information to ensure complete dominance and control over their surroundings. Then again, this may just be a way to entertain themselves when there aren't any mice, bugs or toys to play with.