A Sheep is an animal in Harvest Moon: Seeds of Memories that may immediately be bought from Hunter for 2,000 G.
These are the shep that have not fully grown. With proper love and care, the lamb will fully mature into an adult sheep. It takes a full week (seven days) for a lamb to mature.
Mature adult sheep are capable of producing wool every few days. The more affection that a sheep has, the better quality wool that they will produce.
Healthy adult sheep can be impregnated using a miracle potion which can be purchased from Hunter for 8,000g.
Taking care of pregnant sheep is just the same as taking care of regular sheep, so you don't need to provide her with special care.