Over the winter months my horse has become very spooky. I feel he could be dangerous as he gets startled just by any little noise, he will just turn and run, which sometimes he is in his barn and lands up hitting the wall as he turns to get out,sometimes I am in there with him.When he is outside he does the same thing. Why has he started doing this and how do I correct it before him or I get hurt? The vet suggested he may be going blind and to check, but he seems fine. I need HELP. Thanks