A collapsible pet carrier includes: an interior space defined between opposing side walls, opposing end walls, a bottom wall, and a top wall. One of the walls may be opened to allow access to the interior space. An expandable rigid board is located at least partially within one the walls. In an expanded configuration of the pet carrier the board is located substantially along a length of one of the walls to provide support to the collapsible pet carrier when the collapsible pet carrier is expanded. In a collapsed configuration of the pet carrier the board extends along less than half of the length of one of the walls to allow the pet carrier to be folded along one of the opposing side walls, opposing end walls, bottom wall, and top wall.
