After much testing with different variations(sorry PETA, these were tested on dogs), this is the variation they liked. I printed with PLA, very low infil, then gave the scratches a quick buff with sandpaper just to make sure the points weren't too pointy. Eventually I'll learn opencad and do a parametric version or something, but as it stands this prints decently quick, and my short-haired pit mixes loooooove it.
The author remixed this model.
Rounded and improved the size to fit in the hand better. Changed the lengths of the scratchers. Removed the superfluous handle.