Ulvang has 0 tolerance for mulesing. All our suppliers must provide guaranteed mulesing free wool. We require certificates for this that follow all our deliveries. Mulesing has been a common practice among other things. in Australia. Mulesing is a surgical removal of skin pieces around the sheep's tail section to avoid skin rashes as flies lay eggs in. Mulesing does not occur in Norway, here predators are a bigger problem.