Computer-implemented pet adoption systems, methods and computer program products improve the process of matching up prospective adopters with available animals by optimizing the number of pet profiles displayed to prospective adopters per page, providing authorized personal with different selectable rules for setting the order in which the animal profiles are displayed to the prospective adopter in order to work toward specific adoption goals of the animal shelter, and using historical usage and user-profile data to gauge the probability of adoption between a prospective adopter and the available animals. The probabilistic analysis is used for the purpose of ranking or filtering the pool of pet profiles in order to remove pets of lower adoption-probability from consideration or present them lower down in the displayed order of the profiles.