I think that every dog is different and it's up to you as the pack leader to make it work between your dog and your snakes. I have one German Shepard and one Dogo Argentino and sometimes they can stop and look at the snakes and when they dont do anything to the snakes I give them some affection and some nice words. But there's never been any problems with the snakes.
The rats on the other hand... My Dogo Argentino just hates rats, rabbits, cats and so on. I've found dead rats when I got home from work and she hade somehow unlocked a door in my apartment and got in to the snakeroom.
So I started to take her in to the snakeroom when I was feeding and made her sit, and every time she got up to go to the rats I was pretty harse on her and sat her down again. And as the weeks went she got more and more "friends" with the rats. Now she just sits there and look at them, even when I leave the room for a short while.

So even if your dog don't like the snakes, you can always learn them to

Here's a pic when we had trained for a couple of weeks.
I had some really bad adwise back then, the reptile shop on my street told me that it was best to feed outside of the encloser on the floor... But it's a cool pic when you think about that my Dogo tryed to kill every living animal before.