Wooly and Worth are a sheep and dog duo who appeared in adverts for defunct British retail chain Woolworths from 2003 to 2008.
Wooly was a sheep with a red W painted on his chest and acted dim wtted. Worth was a dog (representing a border collie) who wore a blue collar with a red tag with the letter W on it and acted as the straight man of the two.
Some adverts featured a celebrity or fictional character visit the two (e.g. Darth Vader and Jackie Chan). Worth would then send Wooly to Woolworths to get something relating to said person, only for Wooly to get distracted and buy something else instead.
Plush toys of Wooly and Worth were on sale at Woolworths from 2004 to 2008.