My angel boy of 7 years passed away tonight. My wife put hartz flea treatment on our great dane a couple days ago, and eddie started losing coordination and strength. It wasn’t super “bad” so I just figured he was having a cold or something silly. I had NO IDEA about hartz products being a problem, until today. Last night he was FINE. Today he went full lethargic, to pained cries, then dying in my arms in the span of a couple hours. I am so angry about this and theres no other solution. Symptoms line up completely with the other testimonials. I am so hurt and upset over this.