Have you thought about an Australian Kelpie. We breed them down under
for the exact purpose of withstanding our harsh climate. Kelpies can
work for hours on end in the extreme Australian conditions (i.e. heat,
arrid land, dust etc, etc).
Not only can they withstand harsh weather conditions, they are very
intelligent, loyal, protective & lovable. Have a look at some of the
Kelpie websites - strongly suggest Beloka kelpies. Drop us a line if
you need to knoe more about these fantastic dogs.

Cheers,
David