I have a 2 year old cob, I bought him unhandled about 4 months ago. He has come on so much it’s great, but he’s still scared of rugs? I managed to get fly rugs and stable fleeces on for a while, but since I put a rain sheet on him outside, he’s gone back to being scared of any rug. I’m trying to use a towel to rub over him just now but he’s not getting much better. What else can I do to help him overcome this?