I'm guessing you refer to my cats appearance?
If that so, then there is 3 locations where you can change cats appearance: Jadestone village, Sandstone refuge and Lycandi foothills (wheel of fate area), just speak with cat npc located there.
Here is link for more details (it's in russian, but if you click on 'Show' button you'll see exact map locations and there is also youtube links that shows each locations appearance options)