Help! My rising 3 year old Welsh D is one of a herd of 7. Yesterday we extended the grass they were on and slightly changed the groups. My horse is still with his best pal who he can get quite stressed when separated from. However, tonight he is keeping away from them all yet seems anxious on his own, beginning for company. He's eating well and doesn't appear injured. I'm very worried but as he's at livery, can't keep an eye on him myself all night. Any ideas/suggestions?