Cats are are monsters that require 5 Slayer to damage. In order to obtain a pet cat, a player must complete Gertrude's Cat to get a kitten from Gertrude. Their first kitten is free. Each kitten after that costs 100 coins, although players cannot own more than one kitten at a time. If players have an activated ring of charos, obtained during the Garden of Tranquillity quest, then they are able to charm Gertrude into allowing them to choose what colour kitten they receive while purchasing a kitten. Otherwise, players get a kitten of a random colour.
Cats have several growth stages. Players can use the summoning interface to find information about their pet cat while it is following them, such as its hunger and its growth. The growth time is cumulative, not sequential, so picking up your pet does not reset the timer leading into the next stage.
A pet kitten needs food. If its hunger reaches 100%, it runs away in search of food. Any raw fish, cooked fish, or a bucket of milk can be used to feed a kitten. Additionally, players can feed their kitten at a pet feeder in a player-owned house. When a kitten gets hungry, players receive a series of messages in their chat box alerting them.
Unlike other pets, kittens also need attention. Players must periodically "interact" with a kitten, otherwise it gets lonely and runs away. Stroking a cat requires no items. However, if players wish to play with their kitten, they must use a ball of wool on it, which does not consume the ball of wool, or equip a toy mouse and select the "Play" option. A kitten can also catch rats via the Chase-vermin option, but has a success rate of 15%. When a kitten is about to run away due to loneliness, players receive a message in their chat box alerting them.
Players may own only one kitten at a time. Kittens cannot be stored in a menagerie of a player-owned house.
Players can also dismiss their kitten from the Interact-with menu using the Shoo-away option.
After two and a half hours of following a player, a kitten grows into an adult cat, which no longer needs food or attention. Players are still able to interact with adult cats. The cat's success rate at catching rats increases to 50%.
A pet kitten or cat is also required for the Freeing Evil Dave sub-quest of Recipe for Disaster, one of the rewards of which is the ability to turn a kitten or cat into a hellcat. Hellcats (and their variants) can also be used for quests which require cats.
Another special cat variant, the purple cat, is unlocked via the purple cat miniquest, which is available after completing Swept Away. Purple cats (and their variants) can also be used for quests which require cats.
Black and white
White and blue
Brown and white
This article on a pet has an associated dialogue page. Click here for a transcript of possible conversations with this pet.
A selection of kittens to choose from, shown when wearing a Ring of Charos (a)