1. Get Noggenfogger elixir.
2. Drink it untill you're a skeleton.
3. Go to catform and prowl.
4. Dispell the buff from Noggenfogger.
5. It should turn you into human form again, but you still have the cat form buff
You can re-stealth, so you don't need to carry a million noggenfoggers with you. Works with flight form too. But not with travel form though. (don't know about other forms.) Working on scape at least.
Sorry >_< i forgot, you need to be a skeleton, not small.