My sister has a new horse, Tigs is a registered Thorobred and is 15 years young. She came from an abusive home that basically starved her. I cried when I saw her, spine sticking up and her backside is all sunken and bony. She is getting very good quality timothy hay as well as a 14% sweet feed. Tigs was retired as a race horse at 4 years old to become a brood mare, she's foaled twice and was in a trailer accident that caused some "stoving" of her hind legs. Numerous people that think they know horses have told my sis that because Tigs is a TB, she should not be getting a sweet feed as it would hype her up and that the protein was too high...this horse is a good 250-300 pounds under weight, obviously we don't want her to be too fat, to put some padding over those bones would be best, but not too much. What type of grain should she be getting and how often....she is allowed to graze some while on a lead and is exercised on a daily basis, my sis is anxious to ride her but doesn't want to hurt her with the saddle due to her bonyness. She's had Tigs for a little more than a week and knows that it will take time, she has a ton of TLC going into her, it's the grain thats causing the questions.