Catahoula Leopard Dog Breed information
The Louisiana Catahoula Leopard Dog, also known as the Catahoula Cur, Catahoula Hog Dog, or simply the Catahoula, is named after Catahoula Parish, Louisiana, USA. Of remaining dog breeds, the Catahoula is believed to have occupied North America the longest, aside from the dogs descended from Native American-created breeds.
As a working dog, Catahoulas have been bred more for temperament and ability than for appearance. As a result, the physical characteristics of the Catahoula are somewhat varied. They typically range from 50 to 95 pounds in weight and have short to very short hair. They come in a variety of colors: blue, red, and yellow, in both merles and solids. The archetype, however, is the blue merle. They are known for having haunting, light-blue "glass eyes", or half-blue, half-brown "cracked" eyes, although all-brown is also an acceptable eye color. Some Catahoulas have a short tail.
Catahoulas are highly intelligent, energetic, and quick, yet are generally very loving and gentle with children. They are inquisitive and have an independent streak. However, the Catahoula temperament is not suited for everyone; these dogs tend to be very protective of their territory and family, and also, may be aggressive toward other dogs—especially of the same sex. These traits, combined with their independent nature, their high energy levels, and physical strength, can make a Catahoula "too much dog" for inexperienced or meek owners, and can make having such a dog a liability in suburban neighborhoods. Ideally, a Catahoula should have proper obedience training, secure confinement on the owner's property, and an outlet for its energy.
One theory as to the origins of the breed states that the Catahoula is thought to have descended from "war dogs" (Mastiffs and Greyhounds) brought to Louisiana by Hernando de Soto in the 16th century. Dogs left behind by the explorer's party were interbred by the local natives with their semi-domesticated Red Wolves.
In the 17th century, French settlers arrived in Louisiana. They brought with them the Beauceron and mixed them with the dogs that had been created by the earlier cross of red wolves and the Spanish "war dogs".
Catahoulas are almost always happiest when they have a job to do (working dog). And are not often suited for life as a family pet in a suburban household. Catahoulas make good ranch or farm dogs, as they are a member of the herding group.
The Catahoula is the working dog of the region and is seen on farms and ranches from Texas to Florida. These dogs are outstanding tracking and hunting dogs, commonly used for hunting feral pigs, squirrel, deer, raccoon and black bear.
There are three versions of the Catahoula Leopard:
These three lines were crossed back and forth and created the variations of Catahoulas seen today. 
As a breed, Catahoulas are relatively free of a lot of diseases. They are prone to hip dysplasia and those predominantly white, or a white faced dog with glass eyes, has an 80% chance of deafness either in one ear or both. Catahoulas can have eye problems (tunnel vision, eye won't open all the way, pupil is abnormal, etc.). Some older dogs are known to have gotten cancer.
Breed information on other dog breeds:
Text Source: Wikipedia