Negative Positive
Title: BEWARE!
Review: After using these for a number of years with great results, I must downgrade my opinion of this product from 5 stars to 2. Recently I checked on a mat used safely and successfully for the past 3 winters. Under 4 inches of straw, the temperature of the mat almost burned my hand! (That explains why the dog had been sleeping outside her cubby in the 20-degree cold.) It could have ignited the entire wooden shed. A puppy, injured or debilitated dog may not have moved but instead suffered burns. THIS PRODUCT CANNOT BE TRUSTED. If you must use due to the economy of it, check it constantly.
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