This was something that just started as a quick sketch doodle, but then I started messing about with shading.

Would have completed it but I didn't know the first thing about horse muscle structure and didn't have the interest to get up and search for it on the netz.
But I plan on finishing it.

Essentially - yeah, it's an undead horse. 'Demon' only because I gave it sharp teeth rather than regular herbivore teeth. Why? Because I didn't just want to do an undead horse, I wanted a monster of sorts.

Also, please excuse the random messy dots that appear. My scanner obviously needs a bit of a clean o_o'