Purchased the Sergeant’s Gold for flea control on my dog Kit. Within hours she was exhibiting all of the symptoms I have been reading about. Restless, Vomiting clear liquid, biting at her rear, chewing a “hot spot” on her tail, climbing in my lap and burying her head under my arm (totally unnatural for her), listless, no appetite, one eye inflamed where she rubbed it from always looking at her back.
After two trips to the vet at a cost of $113 I researched the flea medicine. The vet told me to wash her in a dish “detergent” to get the flea medicine off of her. Within 2-3 hours she was displaying signs of her normal self. Appetite has resumed with a vengeance.
Appears this problem has been going on for some time and the manufacturer typically is burying their head in the sand. Just Google the word “cyphenothrin” and find out how bad this chemical is.