Dog days of summer!

The dog days of summer are coming up. That's what they call August. I don't get it - why August? Because it's so hot? It's been hot in July! It's hot in May! Why not the dog days of Spring? And cold, that affects us dogs too! It's cold in the the winter. So, why not the Dogbrrrrrrrr Days of Winter? Huh? Why not? Who decides on these things anyway? Must not be dogs. Gotta go take a nap and ponder this some more.