The Wilderness volcano.
You can find these Hell Rats in the sewers in Varrock, You can find Varrock by exploring your map, have fun.
Heres what you do: You go and fix it, easy as hell, aye ?
Kittens & cats both eat Fish, it doesn't have to be any certain type of fish as long as it is a raw fish.
The quest is Recipe for Diaster (RFD). You must save one of the people there. To finish it you need 175 QPs, but you can start it now. And get your hell cat/kitten.
You have to be a member. You buy kittens from this one person. then you can raise them normally or feed them hell rat things that will make them hell cats.
In the shaking boxes
The Wilderness volcano.
Hell rats can be found in Evil Dave's basement for the quest "recipe for disaster".
You get a hell cat from the quest "Recipe for Disaster". You make your cat "chase vermin" when you are near hell rats and if you do these enough it will turn into a hell cat.
You can find these Hell Rats in the sewers in Varrock, You can find Varrock by exploring your map, have fun.
A brass key.
I think evil bob's part of recipe for disaster
hell rats are found in evil dave's basement(the basement of a house just west of edgeville bank).
u have to do the "evil dave" part of the "recipe for disaster" quest
Heres what you do: You go and fix it, easy as hell, aye ?
There is a place in varrock south-west of the western bank near that lady who sells the kittens.