My poor babies had to be rushed to the emergency clinic last night!!!!

I went and bought Sergeants Flea and tick for my two dogs ages 1 (Border Collie) and 14 week old (Australian Cattle Dog). I usually always use frontline but figuring this was a little cheaper and right at the local store I bought it. I put it on and soon after my dogs started vomiting and being restless they were throwing themselves on the floor in total distress. I washed them with dishsoap. I felt sooo terrible I had no idea they could sell stuff that could kill your pet in the store. I took both my dogs to the Brentwood emergency clinic they were great there. My dogs are resting but still a little stressed out this could be a long night. It is really sad that this can be sold in stores. And if you call the company they say some dogs have reactions.