I used hartz flea treatment on my Labrador Retriever and within 8 hours her back was burned from the chemicals. I had to take her to the vet and spent more than $300.00 to have her treated and several weeks of watching her suffer. I called the hartz number and made them aware of what had happened they did not offer any solutions or any help. She had to be shaved for the chemical burns. Hartz was not symapathetic these products should be removed from the shelf. It was one small tube used on my pet and it was very painful to have to doctor her to see how much pain she went through. It is shameful what is happening to all of our beloved pets I personally will never use another hartz product to treat any of my animals I trusted Hartz before this happened to my pet but after they tortured my dog who had permanent scarring from this everyone needs to know what will happen to your pet and that you will personally suffer if you care about your pets. Its not worth it check with your vet and find a good product for your pets.