a real CO should NEVER! Have a mastiff type face ... 

alot of people won't like to hear what i'm about to say, but they should have a lupoid type skull.

the resemblance with a wolf should be noticable.

that's what bothers me with the modern/show CO type.

they coulnd't be more further from the truth. People have a completly wrong image of what the REAL CO is like. 

70-100kg dogs that fight bears and wolfs ... right...

Ask your self this...

do you realy think a shepherd can use a 65kg+ dog to guard the sheep in mountainous/ steppe type terrain.

walking 20-30km a day ...

and still be capable to fight of a predator ?