A tray lock mechanism for a pet enclosure is disclosed. The tray lock mechanism includes a sliding component that has a camming surface that interacts with a leading-edge of the tray to generate an upward force to move the sliding component out of the way so that the tray can be inserted into an opening and into the pet enclosure. Additionally, in a further embodiment, the tray lock mechanism contemplates a door extension that extends downward and blocks the opening when the door is in the closed position and unblocks the opening, when the door is in an opened position.