I used this on my little pom, he is 6 years old and never had fleas, I saw one on him so I got this product. That is the worse thing I could have ever done. He started losing his fur and scratching himself till blood came out and now his left ear has no fur on it. He has sores on his body and he takes off running for no reason, bites at us (I am sure it is because he is so aggravated), kicks his back legs like a bucking horse and goes off and hides. I could not find him in my house for 6 hours one day. He was hid in the back corner of the closet. He will also get behind the toilet and on the bottom shelf of my bookcase. It is like he is trying to hide from something. He has never acted like this before. I put this on him about 3 weeks ago. I think these people need to have charges or a lawsuit filed against them. This product should not be on the shelf.