Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Heat doesnt last!

i was so excited to buy this product and i had heard so many people that had good things to say about it, but i was very disappointed. The pad was not comfortable for my dog to lay on, but most importantly, the heat didn't last! After about 2 hours, it would be cold again. I would not recommend this product...you are much better getting one of those foil warming inserts for pet beds.