Instruct: Classify Amazon reviews into positive or negative sentiment
Query: happy kat -- Frontline Plus flea treatment

When I first brought my 3-year-old cat home from the animal shelter, I immediately put Advantage on her. Within about 3 hours, she was on the floor in convulsions and nearly dead. Though I hardly knew her yet, I felt terrible, and raced her to the emergency vet (not cheap at 10 pm!). She had to have an IV drip for 2 days to clear the Advantage out of her system, and I was told the Advantage was far too strong for her. I've been using Frontline ever since, and she's remained healthy and happy and flea-less. And since it just went up to $47 for 3 applications at the local pet store, I too Love the ability to get it on Amazon!