If you hike, you need to be aware that it is Rattlesnake Season. From May to October, you could see them around, and they are the only venomous snake in Colorado. Stay on the paths, and if you venture off the path, be aware of everything around you, and listen for the "rattle". It is best if you wear long pants and closed toe shoes. These snakes do prefer to hide, but if they feel threatened, they will strike.
What happens if you get bit?
"Seek medical treatment. The first thing you should do is call 911, and if you're not in cell range, which is harder and harder not to be, get into cell range and call 911. There aren't a lot of things you can do on your own to treat a venomous snake bite, so just try to stay calm and let the medical professionals take care of it."
Do you bring your pup with you when you hike? You can have your pet vaccinated, but there is no solid evidence it really does any good. If your dog has been bit, get to a vet ASAP, and if it is during closed hours - get to a 24/7 animal clinic.
You can have your dog vaccinated against rattlesnake venom. It's a yearly vaccine that helps your dog create antibodies to kick-start the body's process of defending itself in case of a bite. Even if your dog is vaccinated, you still need to seek immediate treatment for them. The vaccine decreases pain from the bite, the amount of antivenom required and the length of hospitalization.