Domain Watchdog is an open-source, self-hosted monitoring tool designed to track the expiration dates and status of domain names. It provides a straightforward web interface that allows users to add and manage domains, receive notifications before domains expire, and keep their portfolio secure by preventing unexpected lapses. The application supports multiple domain extensions and performs regular checks to ensure up-to-date status information. With its clean design and customizable alerting system, Domain Watchdog is ideal for individuals and businesses aiming to maintain control over their domain assets without relying on third-party services.