I too worry about snakes. We have some property in Oklahoma and there are many snakes. We have not seen any but I know they are there. I have not taken my dogs the last two summers. It is first too hot and second I am afraid of them finding a snake. I am under the impression that snakes are very dangerous to dogs. But, rattlers can bite and not release venom. Of course who wants to take that chance. I purchased for our last trip something called snake away. It smells like moth balls. If fact, I have been told you can use moth balls but you have to reapply after the rain. Snake away can be purchased at Home Depot or Lowes or such. You spread it around and it suppose to keep snakes away from your home, log pile ect. I will not allow my dogs to run off leash. I think this is the best advice. I know people want to take their pets and let them run when in the country but, unless your dog will return to you when called 100% of the time, it is too big of a risk. For what it is worth.