I have a herd of 7 mares and 3 geldings ranging in age from 26 to 6. I keep them separated in two paddocks until I turn them all out to pasture. They all get along until the other day. It has been cold, an East damp wind. One of the geldings was shivering a few days before and he was again this day. We usually don't blanket but I brought him in and put a bright red blanket with white web straps on him. As I walk him down the isle way the other horses seemed curious as I led him to the gate. I returned to turn the rest of the herd loose and they all made a bee line for him. The alpha mare at first then lost interest, a few lower level mares continued to drive him from the herd as well as the oldest gelding. Now acting like the herd stallion keeping the blanketed gelding away from the rest of the group. It has been four days without a coat and he has not been allowed to return. Any ideas how to get him back. Put the red blanket on the oldest gelding? Blanket as many as I can and run them together? Reintroduce one at a time?