I don't have a problem killing snakes, it's my Jack Russell that does. She doesn't learn. The first time, we couldn't find a vet with the anti-venin and our local vet said to feed her a pound of bacon, some benadryl and rub alum powder on the bite (spice section in the grocery store). Her head was swollen up about 3x normal. She came through.
The next time, I did the same thing, but she didn't swell up nearly as bad- just her eyes were swollen shut. She came through.
A hoe took care of the last one and a boot heel took care of several baby ones. She's super laid back for a JRT but lives up to the breed's reputation for tenacity when it comes to something that needs to get got.
Note: I was trying to be helpful in the case that one of your dogs gets bit, but out of curiosity called the new young vet that bought the clinic from the older doc and he said, umm....no. Don't do that, that it could cause pancreatitis. So take all this with a grain of salt, some benadryl, a pound of bacon, and some alum powder.