Not sure if this is a bug or you just haven't implemented on iOS yet. I have seen coloured sheep pics online, but mine are always white. Also, I am not able to directly dye the sheep to produce different colours. They also don't follow me when i'm holding wheat.
MCPE-273
Sheep fleece does not represent the sheered wool colour
Resolved
Duplicate
0
(Unassigned)
Tablet - iOS - iPad 3
animal, dye, follow, sheep, wheat, wool
0.4.0
Retrieved
Where's the issue this is duplicating?