Small businesses can learn a lot from wolves.
They hunt together as a pack and the pack members are closely related by blood, affection and mutual aid - not just some random wolves that run across each other.
When businesses work together in coordinated marketing efforts, this is called co-marketing. It's a great way for companies to stretch their marketing dollars while expanding their reach. The efforts can be as formal as a co-branded campaign or product, or as informal as contributing to each other's blogs and social media to help build content.
Most businesses already have some type of tie with other businesses, whether in a B2B client/customer relationship, or through offering services or products that are complimentary.