Domesticated animals remain domestic because their wild needs are regularly met but someday when you are old and feeble or even someday soon if you happen to fall or otherwise become incapacitated to the point where you are unable to feed your animal at feeding time and you are stuck lying there in your apartment with your pet pacing around restlessly, there will not be much to stop your pet from eventually realizing that you are the very same type of food that his/her wild predatory ancestors used to eat once upon a time.
I don't want to go into the details here, so please just try to imagine how this would go down. Would your pet have the instinct to kill you beforehand or would it eat you alive? If so, how? What part of you would it eat first? How long would you survive being eaten?
I wonder how many times this has happened. Why not do a search?