my cats name is frost it took 2 years for me to find the perfect cat that my kids wanted . i applied hartz flea drops on my white as snow cat and his neck turned black . it would not even wash off . i had to take him to a professional groomer . once again he is white and awesome. he is acting very weird . i dont know if its because of that stuff or what but he has become very agreesive and violent , i looked up on the internet about this product to complain . to my surprise there it was many stories alot worse than mine. thanks to god i now know . but what i dont understand how in the he!! does this $hit stay on the shelves with no notice.. im ppppppddddddd off!!!!!!!!!!!!