: As a non-horse person having read this article a couple of times, these thoughts come to mind. 

 :* I'd link "gray horse", not just "gray" horse in the lead.  I didn't understand what was relevant about a "gray" colored horse turning white until I read the "gray horse" article. A bit of clarity here for the non-horse person might be useful. 

 :* In the first paragraph of Mascot duties, call a spade a spade.  Replace manure with feces since manure implies so many more things. (unless this is accepted horse PC). 

 :* I found the excessive use of the third person pronoun "He" and pronoun "Who" to be a bit creepy. Kind of makes it read like the horse does all this stuff on his own.