These snakes were alot darker than the pic's. An unusual colouring.

Most dogs will shy away from snake scent or at least indicate on them. We don't do any training for it, but if you wanted to train your dog to stay away I'd get a fresh, dead snake and an electric collar and when the dog went to investigate the snake he gets a ZAP on high. This should cure any "snake chasing" behaviour. You would have to do some lead up work on the collar first.