Instruct: Classify the given review as either positive or negative.
Query: Not a great idea

Our cat loved this mat and slept on it all the time. Problem was that he started losing hair on his stomach and his skin looked funny like he had a skin condition or rash. We took him to the vet and when she found out we had an electric heater pad she told us to stop using it. It took about 2 or 3 months but his hair has grown back. We kept the cover but threw away the electric heat. Just as we shouldn't sleep with an electric blanket neither should our pets.