As long as you go with good quality hay you are fine. I keep my horses on dry lot year around (I just let them graze up to 3 hours on "grazing" fields Apr - Oct). If you have several horses go with the round bales (although I'd suggest to give botulism shots), if just one or 2 - square bales could be a better choice (less waste).
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."