Why Do Dogs Have Fur?

No card today...just a question: isn't fur supposed to keep you warm? If the answer to that is "yes," then why does my puppy insist on sleeping in front of the heat register by the kitchen sink? I don't get it: it's not even like it's a quiet/dark area, but she ALWAYS takes a morning nap there (as long as the heater is on).


I was just wondering....