Harvest Moon: A Wonderful Life Special Edition

Buying a sheep will cost you 1500g at the ledger, and acquiring golden wool requires you to own the Brush, which you can buy for 500g from Van so that you can wash it.

Washing is not the same as brushing! To be able to wash your sheep, push it to the trough in your pasture and press when holding your brush close to it. Showing your sheep affection may not be necessary for the acquisition of golden wool (some people say it's not, some say it is), but if you want to be on the safe side like me, just treat your sheep like you would your cows - talk, cuddle and brush them.