They love them. I did have to throw one away
Bought these at Walgreens at Christmas for new puppy and older yorkie.  I have 4 of them for there beds. They love them. I did have to throw one away. But since then found out leaving them on all the time another one quit working.  Tried turning on and off.  Still no heat. But I unplugged it plugged back in, and worked ever since. So it may just have a built in heat censor and it shut off. That was few days ago still working 3 days later. Ordered 2 more of them for spares.  My older yorkie had 3 knee surgeries and is 7 so this is great for her.  The new puppy being winter keeps her warm during daytime naps.
Rating: 4 stars