This is a Wolf Spider, they are very common and generally stay outside except during winter months when they find shelter in the warmth. While I agree that they are not "dangerous" because they shy away from humans much like most spiders and aren't generally aggressive unless you disturb them. They are, however, venomous and can cause serious damage and health problems to it's pray. Here's a photograph of someone that was bitten by a wolf spider.
This of course is a more severe case but does show what it can do if left untreated.