If you live in warm country and have "winter" dog, like Siberian husky, and you don't shave the poor thing for the summer, when it's 40 C in the shadow, and ice-cream melt in 30 seconds - I'll personally find you and kill you with the shovel...
We had to shave my husky/wolf/German Shepard/chow mix in summer here in Kentucky, poor girl got way too hot without it. And yes, you leave fur on them! You leave what you need to and shave the excess.
You leave about a centimetre of length