A black snake with white spots could be either a speckled kingsnake or a juvenile black racer. Neither snake is venomous. Their diets consist of small mammals, insects, birds and other snakes.
The speckled kingsnake is usually found in the central to southern United States and can reach 48 inches in length. The black racer is found in the southern United States; juveniles can be about 6 inches long. As the juveniles mature, the dots on their back merge together to form the all-black sheen from which they get their name. The kingsnake derives its name from its ability to hunt and consume other snakes.