Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BEWARE! Uncommon insecticide - could make your kitty sick

Bought this collar for my cat. She got sick. After 3 days I took her to the vet and found out a lot of interesting things about flea control (collars, shampoos, etc) - like how sensitive cats are to different insecticides and how unregulated these products are.Also found out that this item in particular uses a uncommon insecticide in the Carbaryl family. Check the MSDS safety sheet and consult your vet if you don't want to take my word for it.Take my vets advice, only use Advantage as a flea control.