The purpose of creating a Red Missing Dog Poster is to spread awareness and seek help from the community in finding a lost pet. The poster should contain the dog's photo, description, and contact information of the owner. The goal is to make the poster visible in high-traffic areas such as streets, parks, and social media and to encourage people to report any information about the missing dog's whereabouts. The hope is that by creating and sharing the poster, the missing dog can be found, reunited with its owner, and brought back home safely.