This is a tried and true remedy for all sorts of skin conditions on animals. It has been used probably a century or more and we used it at every animal shelter i have volunteered at over 63 years of living. It is very effective, although it smells bad because of the sulphur, but the spray formula help because it is not as hard to use as a dip. But if you need to treat a large, the dip would be better. The spray bottle is perfect for hotspots anywhere, and tails. I highly recommend it, because it truly works. Sulphur very medicinal!