How to make sure that animals stay inside the fences?

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When I put up fencing for my animals they don't stay within the fencing!
- Gates are closed
- Nowhere is there an open spacing
No answer is wrong here, I need some suggestions on how to keep them in.
Best Answer
Make sure that there is no blocks inside at the same level as the fence. Most animals can jump onto blocks and then use that to jump over fences. If you can get out, they can get out. Keep the inside a full block lower than the fence in all places.
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How do I keep animals in my fence in Minecraft?
You can also extend your fence to form a "mob lock"\u2014a small buffer separating the pen from outside with a fence gate to each. This area should be large enough for at least two of the animals in question. For cows and sheep, making both sides a double gate will make moving animals in and out much easier.How do you stop animals from escaping in Minecraft?
If a carpet is put on a fence, a player can then jump over fences, but mobs can't. Fences and Nether Brick Fences do not connect. This allows players and villagers to go through these kinds of fences, but not mobs.Can animals jump over fences in Minecraft?
Double-sided sticky tape is an easy method for deterring a cat from walking on a fence. Cats do not like anything that sticks to their paws or fur and therefore will avoid the area at all costs. This method works best on plastic or metal fences as the tape may not adhere well to wood fences.Lost Frequencies ft. James Blunt - Melody (Official Music Video)
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