My Alfie was nervous of cats the first few times he saw one and refused to walk past one that was lying down on the pavement once. In time, as he saw more cats on his travels he got used to them and now gets all excitable when he sees a cat. I think, in line with what Jessie_pup mentions, introducing him to the shuttlecock perhaps could help. I try and get Alfie used to as many different things in the environment as possible.