Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Kills Fleas, Cat not Dead

I've heard all types of horror stories about Hartz and other budget monthly flea medicines killing 20% of cats. Frontline has not killed my cat so far. Yay! Seems to work fairly decently, although you may need to apply every 20-25 days or so instead of every 30. Doesn't seem to work quite so well near the end of the cycle.