I recently took my vets advice to switch my dog's flea medicine from Frontline to Vectra 3D. He never mentioned how toxic it is to cats. The warning on the label states to not apply to cats. Fine, I give my cat advantage. However, after applying this new medicine to my dog my cat became violently ill and almost died in the middle of the night. After being rushed to the emergency clinic and staying there for 24 hours she is still in bad shape. My cat and dog are close, sometimes they sleep together. I had no idea that by switching my dog's flea medicine to Vectra 3D would kill my cat! And...