I pulled a senior mini from the pens a couple months ago. He has been slowly losing weight so I am desperately trying to find something to feed him to get some weight on... I've tried Reliance, SafeChoice Maintenance, SafeChoice Senior, Senior Carbcare, Orchard Grass & Timothy pellets, Hay stretcher - all dry and soaked. He'll eat about 2 cups and stop. He's been wormed and get's free choice hay. I have him on some pasture now too... What else can I try? A textured feed? Thoughts?