It melted my cats hair off – I have always used this product on my cats throughout the years because it is suppose to be the best possible out there. My cats are strictly indoor but we have indoor/outdoor dogs so I treat them when necessary. I have 4 cats to treat so that is over $100/month. Last month I used it and noticed a few days later my long haired cat looked like the fur on the back of his neck was shorter. He also developed dandruff but I thought that was due to weather change. 30 days later I gave all 4 cats another round and this time I paid very close attention to where it was applied on my cats necks. Now 2 of my cats have had it melt thier hair down. But my other 2 cats seem fine. This time the hair loss was within 12 hours of using it. Hair was about 4-5 inches long to begin with and melted down to being a centimeter long.