 Include with it in the bottom a gentle cooling mat that is covered by a very thick towel to avoid your kitty from scratching it, exposing him or her to possible toxic gel. And seven, do not leave your cat in a parked car, and this also applies to dogs. Remember, your cat may not know how to communicate when they're becoming overheated, so keep a close eye on them as the temperatures soar so that you both can have a pleasant summer.