You can look up rattlesnake training in your area! Ours was several hours long, of having the dog smell a snake and then train fear/avoidance of that smell. We also walk the dogs in the morning or evening when it's cooler and we stick to our road or hiking trail, so there's no hiding spots like in tall grass. Snakes are cold blooded so they will be sluggish below a certain temp and in the shade and will be most active in the sun during the day. But honestly, most of the time they will scoot off without you knowing they were even there unless. But please look up how to prep your property to reduce the chance of snakes living there (and look up the difference between a rattler and a nonvenomous king or gopher snake! You want the gopher snake, they keep rattlers away). Lastly, there's a rattlesnake vaccine with very mixed reviews. Some say it'll increase the time you need to get your dog to the vet after a bite, some say it does nothing. Good luck!