Our Lulu is 14 and has lots of lumps and bumps, the one that is causing problems is the one on her head because she keeps catching it when she scratches her ear and then it pours with blood. Our vet says she does not want to operate because of Lulu's age and problems with her lungs. Someone suggested that I put castor oil on the lump, has anyone used castor oil on their dog, and is it a special sort of oil or ordinary castor oil?.............Thanks