I have a three year old main coon cat that has ALWAYS been healthy. I put a Hartz flea collar on him (the spice scent one). Over the past month, he has lost weight down to nothing and I couldn’t figure out what was wrong with him. I took the collar off two weeks ago and he has lost even more weight, is constantly vomiting and passing very loose stool. He is so I’ll today that he was barely moving. I let him out to use bathroom and can’t find him. He usually comes to my call but not tonight. Praying that he hasn’t went away and died. This brand has also made my two small Yorkies I’ll. Although they are coming around since they didn’t wear the collar nearly as long as my cat, I do feel like my fur baby has passed because of this poison.