Me and my friend have a minecraft world where we have lots of animals, and for some time we had them all tied up on leads so they wouldnt run away. One day, we logged onto our world, and our fox Biff had disappeared.
It still showed the lead tied to the fence we had him on, but biff and what he was holding was gone. We were sad, and checked all around. No biff. We decided he was gone, and to get another. Same thing happened. Then while we looked around, other animals were gone too. Our pig was gone, some of our horses were gone, and an iron golem was gone.
This is really sad to us, and we miss them. We dont want this to happen to anyone else
We both play on different consoles (I use Windows 10 and he uses IPad)
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This is the way the chunk generator works. If an entity is between two chunks when the world is saved it replaces the entity with another one, in this case, the fox is replaced by the leash. The only workaround is to surround them in a fence (though that would be hard to get only one out).

I think this is a duplicate of #MCPE-21416.

I dont know if its chunks reloading when the game is restarted. Some of the animals we had where very close to each other, or even in the middle of the chunk, yet they were still disappearing from the leads. The pig and the iron golem where only about 10 blocks away from each other at most, and they still both vanished at different times. The host of the world also doesnt have many crashes, and thats not when we notice the disappearences.

Despite what #MCPE-21416 says, the comments reveal a lot of people are experiencing entities (mobs, villagers, minecarts, etc) disappearing without any crashes occurring.
Confining entities to the smallest place they can exist in seems to prevent them from vanishing. Animals on leads are able to roam a short distance, and I suspect that’s enough to fall prey to “anything that moves might disappear when you aren’t looking”.