Yes, if you are looking for an indoor option, our dog LOVES his Cozy Cave. It is not technically warming, but since the dog burrows inside of it, it is naturally heated somewhat by the dog's body heat.
For outdoors, K&H makes a great heated bed. Its heat element activates with your pet's weight and reaches 102°F. This outdoor electric bed goes into eco-mode when not in use and meets electrical safety standards. The downside: this bed is not water-resistant, so it should be under a shelter of some sort, and it plugs in, so it needs to be near a safe outdoor outlet.