They've been in the same pasture for over a month now, and have had no change in their diets. The ONLY expception is last weekend the horses had 2 meals back to back of just beet pulp...but they've had beet pulp before.
I suspect its Stormy, my mare, as I found the manure piles where I noticed she was voiding yesterday (but was too far away for me to see if you KWIM). But, without seperating them I can't think of a way to be sure.
We have a big run-in barn for them, so the have plenty of shelter, but until we get a big check we're expecting next month, we can't enclose the stalls (we rent, the barn was here when we moved in, just w/o stalls). Hubby and I are going to make a trip to the lumber store to see if we can't get enough plywood to at least put up at least 1 "emergency" stall to seperate each horse for a few hours to monitor.
Any suggestions on anything else to do?