Do rattlesnakes have poison in their fangs?

Absolutely. Rattlesnakes enter the world armed with both fangs and venom, and are immediately deadly. In fact, when the snake is young they are extremely dangerous. Young rattlers will readily stike when they feel threatened. They do not have any control over the amount of venom that they deliver in a bite (as opposed to adults who are capable of delivering bites without injecting venom, called a "dry bite"). The babies bite and pump massive quantites of their potent venom into the victim, helping to ensure their survival.