Instruct: Classify the given review as either positive or negative.
Query: great product

I have bought 2 of these through amazon for my elderly cat (18 years old). She sleeps on one inside at night set on low on her bed and she has another one outside on a bed that she uses when it is cold during the day. She really likes it. I like that it does not have a timer, and the cover on it is easily washable in the washer.