After using Sergants flea and tick on her, she became really sick. I finally took her to the vet. After a couple of shots and a night there she got to come home today. The vet also showed me a cat that the owners had given the same stuff to last week. It had been there for a week. I only had a small bill but it could have been alot worse if I had not gotten her in there when I did. The vet called Sergants and told them about it. I also called them today and made an incident report. Everyone who has used this bad stuff needs to do also. It is really bad to have this on the market, and have lots more really sick dogs and cats out there. Please do not purchase this spend a little more an go to the vet for your flea and tick prevention.