Overgrown cat

Overgrown cats are pet cats that the player has continued to grow after becoming an adult cat. After 5-6 hours of following the player, a regular adult cat will become an overgrown cat, and will lose its ability to catch vermin (though it can still fight Hell-Rat Behemoths). Overgrown cats may be spoken to with a catspeak amulet, or without it after partial completion of Dragon Slayer II.

Players can sell their regular, overgrown, wily and lazy cats to civilians in West Ardougne in the south-western area of the city for 100 death runes (18,500). This increases to 200 death runes (37,000) with the easy Ardougne achievement diary reward. Use the pet cat on the civilian in order to make the trade. Hellcats do not need to be transformed back to normal cats before being traded in.

There is no limit to how many overgrown cats can be owned. After the completion of the Ratcatchers quest, players can speak to Felkrash to have her train their overgrown cat into a wily cat.

After completion of Ratcatchers quest, an overgrown cat (or its hell version) can be trained into a wily cat by talking to Felkrash. When the wily cat eventually reverts to a lazy cat, it can be re-trained into a wily cat by repeatedly catching rats (both normal and hell-rat versions). If, whilst attempting to train your lazy normal/hellcat into a wily cat, the cat does not seem to transform (it should take about 25 rats), players can pick up their cat and re-drop it to reset the 'training timer', otherwise you could be training your cat for what seems an indefinite time (even hundreds of rats and 1.5hrs+ have been observed without success).

It is not possible to re-train a lazy cat into a wily cat using a ball of wool to play with them or by stroking it, only by chasing rats.^[1] Likewise, having your cat chase a mouse toy will not transform it back into a wily cat.^[2] It is not possible for lazy or wily cats to revert back to an overgrown cat. If an overgrown cat is trained, the only way to get another overgrown cat is to raise one from a kitten.

When fighting Hell-Rat Behemoths, the King rat or in the Rat Pits, cats have the following combat stats:^[3]

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Boss pets	Aggy Baby mole Beef Bran Dark core Dom Huberte Kalphite princess Little Nightmare Moxi Muphin Scurry Skotos Smolcano Sraracha Maggot marquess Snakeling Phoenix Prince Black Dragon Tiny Tempor Vorki Yami Dagannoth Kings Dagannoth Prime Jr. Dagannoth Rex Jr. Dagannoth Supreme Jr. God Wars Dungeon General Graardor Jr. K'ril Tsutsaroth Jr. Kree'arra Jr. Nexling Zilyana Jr. The Forgotten Four Baron Butch Lil'viathan Wisp Raids Olmlet Lil' Zik Tumeken's Guardian Slayer Abyssal orphan Gull Hellpuppy Kraken Noon Smoke Devil Nid Ikkle Hydra Wilderness bosses Callisto cub Chaos Elemental Jr. Scorpia's offspring Venenatis spiderling Vet'ion Jr. Minigames Abyssal protector Jal-Nib-Rek Lil' Creator Penance Pet Smol Heredit TzRek-Jad Youngllef
Skilling pets	Baby chinchompa Beaver Fox Pheasant Giant squirrel Heron Mr mcgroot Rift guardian Rock Golem Rocky Soup Tangleroot Quetzin
Cats	Kitten Adult Overgrown Wily Lazy Hellcat Toy
Other pets	Bloodhound Broav Chompy chick Egg Fish Herbi Mayor of Catherby Rock Spooky chair Archibald
NPC followers	Dr Banikan Elias White Gary Gnome child Grubfoot Ivan Strom Knight of Varlamore Nieve Prince Itzla Arkan Silif Veliaf Hurtz Zanik