My husband put Hartz flea drops on our cats. There was no problem with the large cat, but the small cat, Idgy, has been messed up ever since. She took off immediately and refused to come in the house for two weeks. She will now come in the basement, but her entire personality has changed. She is my 8 year old daughter’s cat. Idgy used to sleep in a box beside my daughter’s bed. She used to spend almost all her time in the house and now we can’t get her to come in. She is just a shell of what she used to be. Now she’s devoid of personality and she used to be the most hilarious, inquisitive cat. I keep hoping that one day her old personality will come back. I will never use Hartz products again. This is truly disturbing.