Snakes under the porch

We have a large snake, under our porch. He comes out when the sun is out. It's been a cause of some concern since our new little puppy could easily be swallowed up by the monster. There is some debate over what kind of snake it is...it seems relatively unafraid of us so far and has put up with a brutal attack by our son, and his friends but remains unscathed. We have armed ourselves with three shovels...just in case. We've researched the snake and are pretty sure...(key point) that it is harmless. Alas, I've been away from the farm too long and don't relish the idea of a snake so close.