Chances are that you won't even see a snake...really. Just be aware of your surroundings and where you walk; keep your dog on leash and don't let him sniff under bushes; don't put your hands around boulders. At this time of year they won't be roaming during the day - it's too hot, but always take a flashlight at night.
It's not like there are hundreds out there ready to chase you. :)
Have fun and don't be too obsessed with it. Just use common sense. We've been tromping around the AZ desert for 18 years and haven't seen any while hiking...just dead on the roads.
