I'm not the first year playing Minecraft and I was always surprised that the game could happen so unexpected that any player could put in a stupor. At this moment, which is repeated not for the first time in my game, I have a game that, with the help of your mistake, steals not the first horse from the best and I would like to draw your attention to this error, since the game is not convenient, and hits the consciousness of the person who was robbed. I would like you to resolve this issue soon.
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This is because of world corruption or a run out a data storage space. There is a different bug with mobs despawning along chunk boundaries, which has been a well known bug, but I doubt that bug is the reason for the loss of your horse.
This report is Incomplete. It does not contain enough information for us to understand and reproduce your problem.
You have not described the problem, you've only attached a screenshot that shows you have a badly messed up texture pack and is displaying a message you haven't bothered to translate. And I have no idea what that has to do with horses, which is the only part of your description that seems like it might be about a bug. I'm sorry, but your English skills don't appear to be good enough to express what you're trying to say. Next time try using Google Translate instead.
As Sean mentioned above, the screenshot suggests that the game files might be corrupted. I'd recommend exporting any worlds you want to keep, then uninstalling and reinstalling the game.
Do MCPE-32501 or MCPE-55137 describe your issue?