Rabies remains a significant public health concern, primarily due to unregistered pets and insufficient vaccination monitoring. This study introduces PetVax, a mobile application designed to address rabies cases by facilitating pet registration, vaccination monitoring, and communication between pet owners and local authorities. The primary objectives are to streamline pet record management, enhance vaccination compliance, and improve accessibility to vaccination schedules. The study follows the System Development Life Cycle (SDLC) methodology, including requirements gathering, system design, development, testing, and deployment. PetVax was developed with the use of technology tools such as Flet, Python, and SQlite. The application incorporates features such as pet registration, vaccination reminders, and notifications of upcoming rabies vaccination events, with all data stored in a centralized database for easy retrieval. The results demonstrate improved pet registration accuracy, increased vaccination compliance, and enhanced accessibility to pet health records. The novelty of this research lies in its integration of digital pet health management within a user-friendly platform, ensuring real-time data accessibility for both pet owners and administrators. PetVax significantly contributes to rabies prevention efforts by providing an efficient, scalable solution for local governments and pet owners.