I was cleaning a stall yesterday while my horse was fidgeting on the crossties because he wanted dinner. I told him that if he didn't poo so much, I wouldn't have to clean the stall. And then I randomly wondered what people call it.
I use several words. Usually manure or poop. The word "feces" makes me think of a full baby's diaper for some reason so I don't use it as often.
"I baked these cookies for the farrier. My horse pooped on him again."
"There are piles of manure in the arena."
"There is a manure stain on the concrete."
"HOLY SH...." (Okay, so that doesn't count for this thread.)
"He was standing up to his knees in feces." (I hope I never have to say that one.)
A friend of mine owns a racehorse with a couple of other guys, and one of them "won" the naming rights. Anyway he called the horse Code Brown (which is the name the horse now races under). None of the other owners had any idea what it meant, so last Christmas day at my friend's place we were all trying to figure out the meaning of the name so his grandson finally went to the computer and googled it. When he brought the printout back to the table and read it out loud, the look on my friend's face was priceless. He couldn't believe he had a racehorse named after that!
I'll admit I can have a bit of a foul mouth (I am married to a sailor after all ) so to friends and people I know are comfortable with it, my word of choice is not family friendly. However, to clients or more traditional folks I'll usually say "manure," sometimes "poop."