Make the sheep fluctuate in the air like helium balloons:

/effect @e[type=sheep,r=5] levitation 999999 1 true


Make the sheep silent (works only on JAVA edition):


/entitydata @e[type=sheepmr=5] {Silent:1}


Click HERE to download the MCPE world


How to import:

1- Download the world

2 - Click on the downloaded file and the game should open with the world straight loaded.

HELIUM BALLOONS

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Command blocks