On Sunday, 9/11/11, I purchased this collar for my 2 year old cat, Princess. 72 hrs. later , I came home from work to find her crying in pain and other than her vocal cords, she was totally paralyzed. Three hours later, on the way to the ER, she died. If you read the product packaging under “note to veterinarian” she had all of these symptoms. These products do not belong on the market. She was just a baby and my “Princess”.