Bests & Worsts Reviews from Amazon

I have two cats from two separate gene pools. Both cats had reactions within two weeks of wearing this collar. 6 yr old female lost all hair around her neck and had two open sores that needed to be treated by the vet - (anti-inflammatory and antibiotic shots). 8 yr old male lost all hair around his neck, half of his face was swollen and his head was red from ears to chin (steroid shot). Bayer was kind enough to refund the money for the collars and the additional veterinary care visit for both cats. Within two weeks of the removal of these collars, both otherwise healthy cats have developed upper respiratory issues. The female overcame hers quickly; the male has been hospitalized twice for dehydration. All tests were inconclusive if these URI's were in reaction to the collars, but I think it speaks volumes that my cats have always been healthy and now I've been to the vet 6 times in three weeks. Bayer is currently investigating to decide if they will cover expensive of the additional testing and hospital stays. I would NOT recommend this product for any cat.