Well if they do, he hasn't been abandoned. You can say you were simply looking after him and return him with a clear conscience while they scope your house for valuables and inevitably break in the following week.
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What if he got the horse plastic surgery so that it couldn't be identified?
You don’t HAVE to. My fiancée’s sister has a horse that had sadly been turned out onto open pasture in The New Forest. He was a nervous boy to begin with but is now a fantastic hacker. He even joined us on the Cranborne Hunt recently. Was absolutely fearless, if a little reckless.