This is the smallest of the waterdogs, ranging from 11 - 16 cm (4.5 to 6.5 in). It has internal fertilization and probably lays eggs in the spring.
The Dwarf Waterdog is completely aquatic. It is an opportunistic feeder and will eat crayfish, aquatic insects, and worms. It is found where leaves and similar debris cover the bottom, in black-water and slow-moving streams, swamps, flooded fields, and irrigation ditches. There are no truly conspicuous markings that aid in diagnosis. In general, the coloration is gray to blue to brown to black with small nondescript spots.
The Dwarf Waterdog has obvious external gills, and has four toes on each foot. It has internal fertilization and probably lays eggs in the spring. It is found from the Atlantic Coastal Plain to the Fall Line and west throughout the Altamaha River drainage.