See we'll be smart and stay on the nice clear track where we can see the ground while still appreciating what's around us.
The Puppy on the other hand loves to run and run and run and run and run through the bushes jumping over trees and I don't know if she has a clue about snakes XD There's apparently some snake test thing you can do with dogs to make sure they have the correct snake response but we haven't looked into it yet and probably should at some stage.
Staying on the path is a good plan...although the snakes don't obey the same logic as we do. Still, they're more visible as you say.
Also, snake awareness for doggos? That's news to me. See? One can learn something new every day.