The three snakes in this area you should use caution with will all have blunt tails. A baby Rattler will have a small Button tip. A Copper-head as well as a Cotton-mouth will have a very hard taper at the tail. The long skinny tail on your snake is enough to know it is a harmless snake.. Those snakes will bite you if you create such a situation where you are harassing the snake to where it feels the need to defend itself. They have teeth that may break the skin but No Fangs and No Venom to worry about. You can consider yourself fortunate that you have that snake eliminating all those rats around your property.