To see sheep in your dream indicates docility and conformity. You lack creativity, individuality and initiative to venture out on your own. You tend to go along with the group. Alternatively, seeing a sheep signifies your compassion. The dream may also be a metaphor on being sheepish. Perhaps you have done something wrong. 

To see a black sheep in your dream symbolises greed and temptation. The dream may also be a metaphor for someone who represents the black sheep in your family. Perhaps it is you who is the non-conformist.