Abstract: A sleeping bag for pets is formed from a multiple ply padded sheet of deeply quilted material which is normally folded along its central portion with opposite halves in overlying relationship to form lower and upper layers and with the edge portions of each half in alignment with each other. A closure means, such as a zipper, connects the overlying edge portions of the layers together to form an open-end bag with a pet entry opening at one end. A plurality of small air openings are formed in the edge portions of the layers with each air opening being of a size smaller than the appendage of the pet to use the bag, so that the air openings and the deeply quilted inside surfaces of the sleeping bag form air passages inside the sleeping bag and movement of the pet in the bag usually causes air to enter into and exhaust from the bag. An accessory attachment pocket is formed in the bag structure for the insertion of flea retardant chemicals, etc.