I need help to desensitize my horse in a stall! He's five years old and perfect when he's out, he's awesome in a trailer so i'm almost positive he's not claustrophobic and I had never seen him spook until he got put into a stall. Usually I wouldn't bother with it but when we go to shows he gets stalled. He seems okay when he can see you but if he has his head down eating or he's closed in and you come up to his stall he almost flips over backwards he gets so scared. After I realized it wasn't just a one time thing I started talking to him really loud and doing things outside his stall first before I peeked in, that doesn't seem to help though cause as soon as he sees you he spooks. If he doesn't know your there he seems really calm and relaxed. After the initial shock he's okay but still nervous and gets slightly stressed which I try to avoid at all costs at shows. When you enter the stall he's still really jumpy and nervous. Knowing that he came from a farm with 70 other horses I highly doubt he has been stalled before, and if he had the nervousness leads me to believe that he didn't have a good experience in a stall. How do I desensitize him in a safe way that wont make things worse?