Instruct: Classify Amazon reviews into positive or negative sentiment
Query: POISON!

Do NOT buy this filthy poison! It gave my poor cat terrible diarrhea and made him sick - I called the emergency vet, and they were well aware of the danger and toxicity of this product, and told me that it can give pets seizures and/or kill them.The only good news here is that this particular vet told me that they will allow pet owners to buy the good flea meds from them and make payments on it, so that people can afford the safe products and not feel like they have to resort to this "over the counter" stuff. If you're having a serious flea problem and are on a budget, call around to your local vets or humane society and see if any of them offer services like this.Whatever you do, DO NOT USE SERGEANTS!