A pet enclosure kit can include multiple discrete flat panels and multiple panel connectors. Each panel can include joined edge segments forming a rigid perimeter of the panel. An area bound by the perimeter can include a mesh, where a weave of the mesh is sufficiently tight to restrain a pet for which a pet enclosure is constructed. Each panel connector can couple two adjacent panels together by connecting to an edge segment of each of the adjacent panels, each of the panels can be coupled using only the panel connectors to other ones of said panels at either approximately one hundred and eighty degree angle or approximately ninety degree angle relative to an adjacent panel. The panels and the panel connectors can be designed to construct multiple different configurations of pet enclosures. Each configuration can have a different height, width, or depth from other ones of the different configurations.