I keep my dogs brushed out and I shave their bellies...

They like to lie in the sun...crazy beasts...lol

It is true what they say about the double coat helping to insulate from the heat though.... there are times when my dogs have been laying out in the sun in +30C weather and they come inside and I can hardly stand to touch them, their hair is so hot...BUT if I push my fingers through the coat their skin is cool.

I also make sure they have lots of water available and shade. Also we don't do anything strenuous during the hottest part of the day.