There are two ways you can actually 'scan' a pony figure for 3D printing...
There are 3D scanners but some of them make the scans imperfect.. and then there is something like 123D Catch.. with uses 360° photos to make up the 3D image... I have not tested this yet myself but I like the idea
Yeah I've tried both so far
The actual scan was pretty accurate but came through in an STL format so you would have to edit the mesh individually or in a program that supports sculpting like Zbrush. And then I tried 123D Catch, and it is actually very very tricky to get an accurate model of the item, and it ends up pulling in part of the surroundings too lol