The cooling device for a pet carrier is a portable system for providing an ice-cooled surface on which a pet can rest. The cooling device includes a housing defining an open interior region therein, adapted for receiving a volume of ice. An opening is formed through an upper surface of the housing, and a lid is pivotally joined to the housing for selectively and releasably covering and sealing the opening. A plurality of apertures are formed through the lid, and a plurality of spikes are secured to a lower surface of the lid and project downwardly therefrom. When the volume of ice is received within the housing, the lid may be closed and the spikes evenly distribute the ice within the housing. The ice generates cooled air, which may be transmitted through the apertures to a pet resting on the upper surface of the lid.