Hi, Since I couldn't get any of Thingi cutters to slice correctly, I've made my own cat cookie cutters my gf for christmas, all of them are traced over pictures from google images. Enjoy :) This set fits on standard 200x200 bed, or you can split it in Slic3r to have single files.

UPDATED 18.12.2014:
-Cutters are now lower, they have 12,5mm height
-Fixed some cat stuff like too thin tail

Try slicing with Slic3r, 2 perimeters, 100% infill (rectlinear) and 0,2 layer height for 0,4 nozzle. If you have better settings, feel free to write them in comments, i will update them here :)