Why I lay in the sun

The other day I went with Mommy when she went out. It was sunny out and I just had to lay out in the sun on my car seat. I was panting very hard, but it felt so good. Mommy asked me, " Why don't you get out of the sun?" If I could talk, I would say that the sun is so warm and I am always cold. Even when I get really hot I don't move to the shade. I guess it's just me!