So I went out to see my gelding tonight and found the gate shut between the two pastures. Him and his new girlfriend were seperated. Come to find out that he's been biting her back, chasing her away from the food, rearing up at her, etc. Yesterday they were the best of friends, grazing together, playing together, what have you, as they have since he came home two and a half weeks ago. They've been inseperable.
So that's why I thought his behavior was so odd. And it changed so suddenly. He whinnies for her to come to the gate and when she does, he pins his ears and freaks out. I couldn't even get a lead on him without him pulling me around everywhere. The only thing that came to mind was that she could be in heat? Is it possible that that could be the cause of his behavior? I hope it's not that they just don't get along anymore because I would hate to have to move him so soon.