I'm so sorry to hear of your loss. I've owned cats in the past and nothing hurts more than losing one to disease (or for any reason) - - but losing one because you used a product generally available to the public and as directed is horrifying.

If Hartz had an ounce of compassion, they would contact you, ask for your vet bills and at least reimburse your out-of-pocket costs due to their marketing of a dangerous product.

I wish there was something I could personally do to get this stuff taken off the market as this is not the first time I've heard of this problem.

You have composed a very well written letter and deserve a response from Hartz.