Minecraft wiki entry for Sheep, associated text: Sheep graze grass blocks, changing them into dirt blocks. In Bedrock Edition, they can also eat the grass or fern on a block, making it disappear. Baby sheep graze grass much more often than adults. Sheep can eat grass through blocks that are less than a full block thick, including extremities such as honey blocks, as well as from inside minecarts. A sheared sheep regrows its wool after grazing. Therefore, if no grass is available, a sheep cannot regrow its wool after being sheared. If an adult sheep has the opportunity, the chance of eating grass is 1⁄1000 per game tick (1⁄50 for baby sheep). If /gamerule mobGriefing is set to false, grass blocks remain, but the sheep still regrow their wool.[1]