Nearly everything that happens in this passage (the dog accepting Matt, Attean sending Matt home alone) represents a huge shift for Matt. Matt is now accepted among Attean’s friends and family, while his solo trip home illustrates how competent he now is at putting all the things Attean taught him into practice. This all makes Matt feel a lot better about being alone in the wilderness, because he’s not alone anymore—he has friends and allies who will help him, and who he can try to help in return.