Generic Pony Model (SFW ONLY PLEASE)

So, I’m planning on doing an animation, of showing a pony sign language equivalent, and I’d need to use a model pose-able in Blender to show each movement.
 
I don’t need this model to have hair, or be any specific pony, but I do want it to be able to make different mouth shapes and facial expressions. (Especially, rounded mouth for both the wide and narrow mouth openings, in addition to unrounded)
 
I am willing to give credit, if this model already exists, or if I must commission a model with the extra animation bones.
 
Thanks in advance.