Pretty hard to put oil on the skin of a shepherd with a thick coat. Lol. Unless i could dip her in it! Her whole underside was peppered with them.Have you tried oil on them? If on the dog's legs it should work well and quickly. Two nurses in my family use it on their children, Skin So Soft preferred, but any oil will do as it smothers them. Rub on thoroughly and leave a minute. Then just wash them off with Dawn or dog shampoo.