It's rattlesnake season here in San Diego. All snakes serve an important part of the ecosystem. They are the first line of defense against rats. However, it's scary when they get into your yard. Instead of killing the snake call a removal specialist. If the snake is your house, call 911.
Tom Minga also does training to teach your dog to avoid rattlesnakes. He trained my dog and she is much more cautious on our hikes. Tom uses live rattlesnakes that are muzzled and have their venom glands removed.