Nareau
Explorer
I dunno, I think the skeletal horses would be much better than living ones:
Horse skeletons are free, if you know where to look
You don't have to train a skeleton
You don't have to feed, water, shelter, provide medical care, etc for a skeleton
A skeleton can work all day, every day, never needing to rest
People are less likely to try and steal your brain-eating skeletal horse
More to the point, though: Horses are valued for their endurance, ease of domestication, and strength. But all skeletons are infinitely durable, and totally under your control. So ditch the skeletal horse--plow those fields with Crocodile skeletons!
Spider
Horse skeletons are free, if you know where to look
You don't have to train a skeleton
You don't have to feed, water, shelter, provide medical care, etc for a skeleton
A skeleton can work all day, every day, never needing to rest
People are less likely to try and steal your brain-eating skeletal horse
More to the point, though: Horses are valued for their endurance, ease of domestication, and strength. But all skeletons are infinitely durable, and totally under your control. So ditch the skeletal horse--plow those fields with Crocodile skeletons!

Spider