I lost my two babies after using the Hartz ultragaurd drops. I followed the directions perfectly. And they were fine the first two days. Then the third day they had become lethargic and not eating. I thought they were just tired from running around after each other at the park. After that they just seemed to get worse. Not eating, not drinking, and lack of energy. I took them both to the vet, explained what had happened and what I used. And was told that I had unknowingly poisoned my dogs. He did everything he could for my babies, but it was too much for them. I miss my babies everyday. This stuff should not even be on the shelves anymore. I hope people read these comments and realize that they’ll hurt their baby by using the hartz products.