They are the largest and most aggressive of the cattle dogs, bred to handle wild cattle and hogs in the roughest, most remote country. Catahoulas will also hunt coon, bear, or whatever else they are introduced to. A farm or ranch is really their element. Catahoulas are bred to go and find livestock in swamps, hilly canyons, thickets or forests, or mountains. Many variations on this general pattern.
Spots occur in all colors.
Often a dog will have eyes of two different colors. They are more primitive psychologically than most breeds and need consistent obedience reinforcement. The owner must understand the Alpha concept and stay in control at all times, but still be loving to the dog. Leopard Curs , Catahoulas, Blackmouth Curs, Mountain Curs, etc., are all branches of the same root stock, but since there is no absolute documentation of the chronological history and precise ancestors involved, much is left to speculation on exactly when and how these several varieties emerged. We probably will never know their exact heritage until and unless DNA samples from today's dogs and their suspected canine relatives are tested.