Review on HARTZ Waterproof Flea Collar for Small Dogs: 7-Month Protection, Up to 20 Inches Neck Size by Angela Campos

I don't know if the company is at fault so I want to be careful. My dog has been very ill since wearing the collar. You could say the poison worked on him. It has a strong odor, and we humans had to wash our hands immediately after stroking it, otherwise our skin and eyes would start to burn. Let's look for a more natural solution. During the week or so he wore it this continued and his fleas seem to be gone so I had to give it a few stars but I think that chemical would have killed the big animals in the zoo as well.