Thank you for sharing this letter. I work in an animal shelter, and I have just forwarded the link to our Executive Director. We use several Hartz products, but we have not used their flea medication. Thanks to your letter and the research it prompted me to do, I doubt we ever will. I'm sorry that your friend is no longer with you, but by sharing this letter you may have prevented others from experiencing this tragic situation. Again,thanks, and you have my sympathy.