Hi There,
Too much of anything they're not used to can lead to discomfort. The questions you need to ask yourself are. How high a protein hay compared to how high a protein diet she's used to. Is she founder prone? Is she stalled or turned out daily? What's her normal water intake? Is she passing manure? Is she willing to eat? She should pass a pile every 45 minutes at least. Do you know what her belly should sound like? Is her belly making normal gut sounds? Free movement/walking is good even if it takes all day :) Check her piles to see if they're unreasonably solid and dry with mucus membrane in them. Horses are designed to have something in their gut all the time, but if they're not fed that way all the time, it could lead to bellyache issues. If your really not sure, call the vet. It's always better to be safe than sorry. Take Care
"If the rider is not in harmony with the nature of the animal, then it will perform as a burden with no display of pleasure."
"Thou must learn the thoughts of the noble horse whom thou wouldst ride. Be not indiscreet in the demands, nor requiring him to perform indiscreetly. The horse is a wise animal. Let him show you the best and most natural way to accomplish a desired end."
