I have a cat with severe flea allergies. She's an indoor cat, but she escaped on me one day and became infested. I bought Revolution because it's supposed to be marginally safer than Frontline. I used it according to the directions. I liked that my cat had zero adverse reaction to it, and for the first few days it seemed to be working as promised...she stopped scratching herself bloody and losing fur. But in a few days she was back to being scabby. I waited one month, as directed, and applied it again, with exactly the same... read full review »