Thanks to Noah for this. He says:
Although, not a mini horse, the mini zebu should be an apt substitute.
Considering yesterday we used a mini baby donkey in this spot normally reserved for mini ponies, it's only right to end the week with some othe completely random mini animal. I had never heven heard of a zebu before I got this email from Noah. Now to immediately find out there are miniature versions of said critter? Fantastic.
This is on par with the mini Scottish Highlander. I think if we receive only one more submission of either animal, PSAMP will become the authority on those as well as mini ponies.