In what may be a first, this product was tested on humans before we decided to allow the animals to use them. After the first day of use, when we had a hot day, one of the Great Danes would get his cooling collar out and bring it to us when he needed it. One of the other pets would not wear a collar under any circumstances -- but he would wear this without a fuss. My current pet (pictured Top) goes berserk when he sees me charge his canine cooler up and can't wait to get it on. Absolutely recommended for Animal welfare in the heat