Small is for hamsters and gerbils and is 4 length x 3 width x 3 height inches. Medium is for larger hamsters, rats. 6 length x 4 width x 4 height inches Large is for Chinchillas, Guinea Pigs. 9 length x 5 width x 5 height inches.
Small Pet Cardboard Carriers has different options and/or variations, please choose below.