When raising a kitten, it needs to be fed and interacted with. Kittens will eat any raw fish, cooked fish, or a Bucket of milk. Interacting with the kitten consists of stroking the kitten, playing with toys (Ball of wool or Toy mouse), or catching rats. If your kitten catches 100 mice, you will be awarded a cat training medal.
A kitten will take approximately 2.5 to grow into a Pet cat, at which time you can trade it for 100 Death runes to Civilians in West Ardougne. If you have completed the Easy Ardougne tasks, the price increases to 200.
It is possible to turn a Hell kitten into a purple kitten (and vice versa), however, it will only result in a normal Hell kitten (or purple kitten); when you cure the kitten off its hellish ways, you will be left with a purple kitten once more.
The various growth stages for purple cats are: Catspeak amulet.
Follower: A friendly little pet.