I bought this filly about a month ago. She was never worked with, never handled. I started working with her. Last week I started Halter training, and she has been a perfect peach! I can lead her around. I've noticed dandruff flakes, but didn't think anything of it, in fact I thought it was caked on mud. Today I was able to start grooming her and feeling her all over. I took the rubber curry comb and rubbing it all around her body. I stopped and freaked out because there is this huge 50 cent section on her back that's scabby and hairless. I then turned my attention to her mane where I saw the dandruff and realized it was also rain rot. There is also a spot of her face. I called up my vet and he said to use a home treatment of Listerine and water mix, until Monday when he can come and check her out if it doesnt look like its healing. I looked in the cabinet and saw scope. Will that work as well as Listerine, or will I have to use less water, or should I just buy Listerine? Thank you.