I say there is I do not on one or never owned one but boy I sure got to work cattle behind some dang good leps. They had good ears and top nots on there heads most were cracked eyed not blue!! These dogs would spin a whole in the ground in front of a herd of cows!! They did not have block heads!!
This is my old school catahoula ( he ain't no nalc bay pen dog ). He came from stock dogs that the old families used to catch their cattle and hogs out of the woods with. He hunts out 100-300yds but goes 600-800yds in sign. He listens good and minds. He is not aggressive towards people unless a stranger comes near my lil girl and then he will eat their boots off their feet.