If you love your dog, you’ll take careful consideration of what is about to be said. Your dog, just as a person, has feelings. It knows when it is hot, it knows when it is cold, and it most definitely knows when it is comfortable. It just has a hard time expressing its feelings because of the language barrier between dogs and humans! Your dog, at night, loses body heat rapidly resulting in an uncomfortable sleeping experience for the dog. dog pajamas fix that problem by locking in any body heat generated by the dog and recycling it, thus raising the dog’s body temperature.