Castor Oil for Dogs and Cats

My 7 yo Cavapoo developed a histiocytoma-looking growth on her leg. It began irritating her after a month, because she gnawed it to the point I took her to the vet. Vet gave an antibiotic, did two separate wait-and-sees. I began applying castor oil at night, covering with thin gauze. Another drop during the day leaving it uncovered. Growth greatly reduced after 1 week. Gone by 3.5 weeks. I'm very pleased with the results and wished I'd done it from the start.