Sun bathing and sun avoiding dogs
Do they absorb it through their noses? The inside of their ears? How else could it get in?! Everything else is covered with fur.
I can't think of any other explanation for Meadow's sunbathing habit. You'd think a dog with such a thick coat would avoid heat at all costs. But Meadow's always been a sunbather. Often she'll come in after a sunbathing session and her fur is really HOT. Perhaps such a thick coat keeps that heat from penetrating to her skin or her blood.
Blocking a doorway as she naps adds just a hint of daring and danger to the activity. As if she's daring Meadow or Finn to pass without paying the toll.