If this saves one dog’s life I will be happy! I bought Hartz 2 in 1 Flea and Tick Spray and used it once on my 15 week old puppy. I am EXTREMELY lucky that I took him in when I did because I almost lost him yesterday. If I wouldn’t have given my vet the bottle he would not have been able to treat him in time. Thankfully he was treated before it affected his brain. I will NEVER buy any form of Hartz product ever again.