This was not from my thread, but it's the same product and problem:
http://www.yorkietalk.com/forums/showthread.php?t=91979
Seargents Flea/Tick Prevention. Causes damage to their nervous system. We spent 2 nights and $1500 after applying it to Xena.
I also want people to know that you have to use Dawn Dishsoap to get the stuff off your pet; soaps, and shampoos don't work. This I was told directly from the Manufacturer.