hmmm its kinda hard for me to believe that a shampoo would give a dog seizures unless the dog was eating it?? still - we threw the free shampoo samples away as Jillian's "rose and yogurt" scented shampoo is good with her There have been news stories about fake tick/flea products - not only from Hartz. That contain chemicals your animal and you yourself should *NEVER* be near, so everyone should make sure what their buying is the real deal.