I used the hartz flea shampoo for my German Shepherd, German Shepherds tend to have sensitive skin so I though this would be perfect. The next few days after I used this product for the first time ever he started to lose his beauty hair and didn’t want to eat or drink water, he started to act very different. It took months to get him back to normal. It’s been a year now and you can’t tell anything happened. I’m sorry for everyone who lost they’re beloved pets.