I used Hartz Ultra Guard Pro on my chihuahua about a month ago and the very first night he started throughing up. My husband has cancer so I was unable to take him to the vet. He through up every day for a week then died. It is so painful to write about that I am crying as I type. Something has to be done. My husband said he was acting like he was poisoned so I got suspicious about the flea drops and I found your site. How many pets have to die before this stuff is pulled off the market?