Cats are indeed traditional, because they are:

  1. Disarmingly adorable (as demonstrated above)
  2. Equipped with several sharp points
  3. Incapable of giving any fucks (as demonstrated in the bottom left panel of the above)

But really, any animal minion you desire can be adapted to your purposes. Just make sure you are fully cognizant of the commitment you’re making, and remember: if you adopt your animal minion, they will be that much more loyal to you.