Nice Pic's AWD. I had my English Setter Snake Trained 2 years ago and thought it worked well. But this summer I noticed she was killing the Western Gardner snakes in the yard and in mid-November down in Burlington we came across an un-happy rattler which we almost stepped on. My English Setter was more than willing to tangle with it and luckily I had her on a lead. So long story short she will be back again this summer for snake training. I know that the Colorado Gun Dog Association has Snake Training 2 days in June.
As for are do they get bit. The snakes are defanged and the dogs get a, shall we say a memorable zap through the E-Collar when they approach the snake (see AWD's pictures)