Of course the only chance the snake has, is not to be found. I dont think any kind of snake is able to outrun a dog or a meercat over a meaningful distance. So the only option for the snake is to remain motionless and trust in the excellent camouflage pattern it has.
And on not to be smelly, of course. As far as I know, this is not completly unknown in the animal kingdom.
Little deer babies for example, also dont have a smell. And they apply the same kind of strategy as the snake: laying still and rely on the camouflage pattern, no matter what. Even if you stand right in front of them, they dont try to run away.