My mare, Bella, has poo that is not as formed as my other mares. Indi's poo is more like what I imagine horse poo looks like with "biscuits" (that's what we've always called them, lol). Bella's is more like cow poo. I have asked her previous owner who stated it was just from grazing in the pasture, yet all the horses at the barn graze in the pasture and none of the other horses have this softer poo. They were both wormed 2 months ago with ivermectin. I stopped giving her apples (she was only getting roughly one apple total a week). I gave her a dose of Probios and the next day her poo was firmer and had biscuits. I went on vacation on Monday, came back on Thurs night, yesterday I go to the barn to take care of the mares and her poo is back to being like cow poo. Is that normal for some horses?