Exemplary embodiments of the present disclosure include a pet cooling/heating bed having a base portion and a top portion. The base portion can include an outer shell defining a cavity. A fill material can be disposed within the cavity of the outer shell to provide a pillow-like structure. The top portion can be detachably fastened to the base portion, and can include a compartment defining an interior area. Embodiments of the pet bed can also include a thermal pack insert and a fastening device. The thermal pack insert can be dimensioned and configured to fit within the interior area defined by the compartment to provide a surface area on the top portion to cool or heat a pet. The fastening device can detachably fasten the top portion to the base portion.
