In this final paper I will focus on the UI/UX design of an application called DogFit. The DogFit app is intended for dog owners and focuses on three main aspects : dog care, walking and tracking fitness activities, and organizing „dog sleepovers“ where owners can leave their dogs with other users or take in dogs for a certain period. The application prototype is a crucial tool in the development process as it allows visualization and evaluation of the design, functionality, and user experience before implementation. The first step will be to explore the meaning of the user interface, followed by describing the features and capabilities of the UI/UX design tool Figma, which will be used for the graphic design of the application. As previously mentioned, the DogFit application will have three main sectors : dog care, walking and tracking fitness activities, and dog sleepovers. The dog care sector is a forum where people can post and communicate with others regarding dog care and needs, allowing users to track their dogs' health and needs. The walking and fitness activities sector enables planning and tracking of daily activities. The dog sleepover sector is for arranging dog sitting with other users or taking dogs into their own homes for a certain period. The conclusion of the paper will analyze the advantages and disadvantages of the techniques behind the application and how the prototype can be transformed into a functional and useful application. The goal is to identify key steps and recommendations for further development to make DogFit a practical tool for all dog owners.