Who can tag me in a post? If I move this file to another folder, who now has access? If my owner breaks up with his friend, will I still get a bone? Whether you're a human, or a dog, let's face it, authorisation is hard. Role-based access control is a great starting point but hard to scale. Attribute-based access control scales better, but neither are much good at answering more complex conditions, like whether friends-of-friends can read your posts. For such situations, we generally have to wrap this up into business logic. This is where relationship-based access control (ReBAC) comes in, offering a nuanced approach to accessing resources without codifying that into the applications. In this session, we'll look at how to define these relationships, experience live demos, and discover how we can deploy our own fine-grained authorisation service. Expect some tail-wagging insights and a few laughs as we explore access control from a canine's point of view.