I got the two separated so I can feed them individually, and now the mare has dropped about 100 pounds in a week. I know in humans, it is dangerous to lose too much weight too fast. Is this also a concern in horses? I am not starving her, and her owner knows she needs to lose about 400 pounds total.
She is currently getting 1-2 flakes of hay twice a day and a cupful of oats with her supplements at night. There is no forage to speak of in the paddocks. She came from the Willamette Valley to Central Oregon 2 weeks ago, which means she went from 24/7 grazing on rich pasture grass to this situation. (We put her on probiotics for the transition and she has done great).
So, do you think I am making her lose weight too fast?