Instruct: Classify a given Amazon review as either positive or negative.
Query: Not too sure...

I bought this for those freezing night times when I'm sleeping with the window open and using the ceiling fan. I thought my dog would be chilly and hoped that this insert would keep her warm and toasty. I've only used it for a couple of weeks, but I find it to be a lot warmer than I expected. I was hoping that it would be "warm" not "hot". Even though it is under a dog mattress, and has several inches of padding on top, it still seems to be hotter than I would want. My dog is ok with it for a time, but eventually I find her out of bed sleeping on the floor. I plan to keep it and use it when it's really cold, but beware, it's quite a bit hotter than a "medium" on a human heating pad.