I made the mistake of using Hartz flea spray on my 1 year old Chihuahua this past Sunday. Two days later she was lying on the couch and couldn’t hold her head up. I put her on the floor to try to see if she could walk and she couldn’t. It was like my dog was drunk. I was panicked because I couldn’t imagine what was wrong with her. Since it was 8:00pm, I had to rush her to the emergency vet. $300 later I found out that it was the $4 flea spray. The vet had to detox my dog. They bathed her and kept her all night, giving her meds via an IV. I am just really lucky that I got her to the vet in time. Another victim, and I was so unaware until it happened to me.