Do Not Use Sergeant's Products! I applied the Sergean'ts Silver Flea & Tick squeeze-on to our one year old dog. This dog is not just a family pet, but is also my son's service dog. She has had flea treatments before as a preventative, and has never had an adverse reaction, therefore none was expected. However, she quickly became violently ill from this product. We are very lucky that I recognized the symptoms, and acted quickly. There is No excuse for such a caustic product to still be on the market!