Just saw this on the local news today. DON'T use Hartz, Sageant, or BioSpot flea and tick drops. They can cause seizures, and even death. They contain a pesticide that's also in insect sprays called pyrethrins, so read the label on the flea and tick meds you buy for your dog.
Read more here:
http://www.nbclosangeles.com/health/tips_info/Pet_Products_Concern....