Rip and Rap are twin sheep dogs, and they look exactly alike except for one extra stripe on Rap's tail, but when Rip gets a mud strip on his tail, it looks just like Rap's, and nobody in the farmyard can tell the two apart.Rip and Rap are twin sheep dogs, and they look exactly alike except for one extra stripe on Rap's tail, but when Rip gets a mud strip on his tail, it looks just like Rap's, and nobody in the farmyard can tell the two apart.