The colt we got, is too skinny. Previous owner had him on 12% sweet feed, and limited hay and was kept in a small pen (he could not get up to a run). She had him for 4-5 months I believe. He has no muscle on his shoulder and his top line, hip and neck is weak looking. He definitely needs better nutrition. He is on free choice hay, and we got a feed that is 14% protein, 10% fat, 15% fiber. Is this sufficient or can someone recommend something better? (woman at feed store recommended this to us, it is Sentinel Grow & Excel) I have a weight tape coming so I can better estimate his weight.