The snake proofing place had live snakes in cages along a trail. Shock collar on the dog. Everytime he got curious about the snake they shocked him. The dog then associates the smell and sound with a shock. It was a low level shock but more than enough for him. Some dogs take more than one trip...
We have about four of them in our yard. Our neighborhood was a game preserve and is mostly trees, so they have plenty of nesting spots and food. We had them in Tennessee but rarely saw them. It’s a daily occurrence here.