I have always been interested in the black-mouthed curs AND the Catahoula's. Don't know anyone that has a Black-mouthed cur. When we were needing a dog, I did look into that breed, but there are none around here.
Most people don't realize "Old Yeller" was a Catahoula.
Our best dog came from some folks named Birrer in western Montana. The son now lives in Nebraska. They have raised these dogs for almost 50 years and I believe they must go back to some Black-mouth curs. They are yellow or red, with white markings and short ears that do not stand up.
If you look at my avatar that is a picture of the last one we were able to get. We have her now, and she wants to be a cowdog, but she sure isn't anywhere near as good as the old dog we had. But she is still young, not a year old yet. I hope to have someone help me today post some pictures on here and we will try to get a picture of her. A very unique thing these dogs possess is a line up the back of their neck. It is a ridge of darker hair that stands straight up when the dog is aroused by something strange. It looks like the hair on a Rhodesian Ridgeback. These dogs are double tough, this pup is not. Not yet anyway. They were excellent guard dogs, so far this pup likes everyone.
Our old dog never, ever, in her whole life ever barked at a cow. She was a great dog and a lot of help. If I can figure out how, I will post a picture of her.