Sorry I have not read all the posts, so no idea if this will work.
My TB was returned to the organization that adopted him out because he chased the cows. He was the only horse in a heard of cows. Although he was an idiot, I feel he just wanted company. I watched him in with the cows, he would walk towards them, they would start to walk away, he would follow the cows as they went faster, then he started to trot towards the cows, the cows went even faster, then the was cantering after the cows. But was he chasing or was he following. He liked the cows but the cows did not like him.
He wanted company.
PS So glad they returned him, I loved the nut!