I am picking up a new horse on Friday and have heard she may be in rough shape. There is a hay shortage where she is being kept and am curious as where to start and what to start her on when i get her here. She has been eating shredded straw and hay mix, with maybe some grain (unsure of what kind), she is under weight and wormy. I have ordered a Panacur powerpac for her to start her on for worms but am unsure of what sort of supplements and grains i should be putting her on and how much? Would Probiotics be good for her to start? Thank you for your time and look forward to hearing what people have to offer.