If he's that fat he's at serious risk of developing laminitis, you have to cut his food right down and put him in a starvation paddock (bare with abit of hay or very little grass). As for him being spooky i cant advise you without seeing what he does and how you work him. Id get a professional to help you sort out those issues, ive helped back some very nervous ponies, it takes time patience and alot of confidence from you, if your nervous your pony will be too.

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