>>275382620
it has three full IKs skeletons, each with some unweighted bones. 
One rig for the humanoid fbt avatar at the front (dummy from the waist down) 
Second rig for the horse legs at the front (dummy from the waist up) targeted at the endpoints of the fbt rig so it copies the foot movements
Third rig at the hindquarters, (also dummy from the waist up) targeted at duplicate endpoints moved further down the body that follow the original fbt hips.
Don't worry, even though it's the same IK calculations as three whole players, it only counts as medium performance 

>>275383003
The furry one is already shared, but you need to know how that concept works to do anything more complicated than pallet swap his fox or stick a dick on it.