Well, just wanted to give some feedback on the class in case somebody else is interested in doing this for their dogs.
It took my Brit 3 goes but he finally got the idea that he didn't want to go anywhere near where he smelled rattler. As KFHunter rightly pointed out I think the mass amount of other smells around played a role. The class I went to was held at a dog park so it was smell and sensory overload for my 1 1/2 year old dog..... he just didn't get it the first 3 times but after that 3rd zap he did.
For the "proofing" part of the class, Daryl (who runs
www.rattlesnakedog.com) put the cage under some brush and then we would walk by the cage and I can tell you Opie would pull me the other direction and definitely didn't want to go near that thing again. I tried probably 5-6 times to get him to go near it and he wasn't having it.
I thought Daryl did a good job running the class and also going over the "cues" to look for in your dog if he smells a snake. That being said, I still got him vaccinated. Lord willing we will never have to deal with this in the field.
Hope that helps someone.
Cheers,
Jg