Dogs and children really can become the best of friends within a family unit, looking out for and after each other.
This relationship appears to be starting at a very young age for this little toddler. Having just gotten her evening bath, and been wrapped up in a towel to keep her warm, her own comfort and body temperature is the last thing on her mind. She is far more concerned that her golden retriever buddy is nice and warm.
So to ensure this, she takes her own towel and puts it on top of the dog who is lying peacefully on the floor. You can see by the dogs reaction that this is a normal event, as he lies there patiently and lets the child tuck him in.